Six Eras of the Silent Service: An Illustrated History of Combat Beneath the Sea, from the Civil War Hunley to the AUKUS Pact
Charleston Harbor, February 17, 1864 • The Confederacy's Hand-Cranked Death Trap
The H.L. Hunley was a 39.5-foot iron cylinder, propelled by eight crewmen turning a hand crank to drive a single propeller. Its hull was a converted boiler. Designed by Confederate engineer Horace L. Hunley to break the Union blockade of Charleston Harbor, it sank twice during testing — killing 13 men, including Hunley himself — before its final mission. On the night of February 17, 1864, the Hunley rammed a 135-pound spar torpedo into the hull of the USS Housatonic, becoming the first submarine in history to sink a warship in combat. The Hunley itself never returned. The wreck was located in 1995 by Clive Cussler's NUMA expedition and raised in 2000; modern analysis suggests the crew was killed instantly by the torpedo's blast wave reflecting through their own hull.
Hunley (1823–1863); Dixon (1837–1864)
Hunley was a New Orleans lawyer and customs collector who funded and partly designed the boat that bore his name. He drowned on October 15, 1863, in the second test dive that killed seven additional crew. Lt. George E. Dixon, a young Mobile engineer, took command and led the final mission. He carried a $20 gold coin (a gift from his sweetheart Queenie Bennett, bent during a leg wound at Shiloh) recovered from his pocket when the wreck was excavated 136 years later.
Mobile-based engineer who designed and built the Hunley with William Alexander. Survived the war; emigrated to Halifax, Nova Scotia. Drowned in Halifax Harbor in 1879 while testing a torpedo for the Royal Navy.
The 1860 $20 gold piece in Lt. Dixon's pocket, bent by the bullet that struck him at Shiloh. The inscription read "My life Preserver. G.E.D." Recovered intact in 2002 when the dead were exhumed.
1,240-ton steam sloop on Union blockade duty. Sunk in 27 feet of water. Five Union sailors died. The wreck was largely dispersed by 1909 dredging operations; only the propeller survives, in a Charleston museum.
Adventure novelist whose National Underwater and Marine Agency funded the 14-year search. He had previously found the Mary Celeste and the U-20 (sinker of the Lusitania). Hunley was his most personally celebrated find.
The proof of concept that took 36 more years to mature into the USS Holland (1900) and 50 to become a strategic weapon. The Hunley's lessons — that a small underwater attacker could kill a much larger surface ship at relatively low cost, and that the asymmetry made the technology unstoppable — became the bedrock of every submarine doctrine since.
Atlantic, Mediterranean, North Sea, 1914–1918 • Unrestricted Warfare and the Lusitania
Imperial Germany entered the Great War with 28 U-boats and ended it with 373. Their pre-war strategic role was reconnaissance, but the realities of British surface dominance pushed Berlin into commerce raiding. On May 7, 1915, the U-20 sank the British liner Lusitania off the Irish coast, killing 1,198 including 128 Americans — a catalyst for U.S. public opinion and, two years later, intervention. The German declaration of unrestricted submarine warfare on February 1, 1917 sank 880,000 tons of Allied shipping in April alone, threatened to starve Britain by November, and was beaten only by the convoy system, which Britain reluctantly adopted in May 1917 after months of staggering losses. The U-boat campaign sank 5,000 ships and 12.85 million tons of Allied shipping. Germany lost 178 U-boats and 5,134 submariners. The age of submarine commerce raiding had arrived.
Holtzendorff (1853–1919); Schwieger (1885–1917)
Adm. Henning von Holtzendorff, Chief of the Imperial German Admiralty Staff, drafted the December 1916 memo arguing unrestricted submarine warfare would force Britain to the peace table within five months. Cmdr. Walther Schwieger, captain of U-20, gave the order to fire one torpedo at the Lusitania at 14:10 on May 7, 1915. He died with all hands when his next U-boat, U-88, struck a British mine on September 5, 1917.
First Sea Lord 1916–1917 who initially resisted convoys, fearing they presented "huge targets." His successor, Beatty, implemented them. Sinkings dropped from 25% of vessels to under 1%.
U.S. Navy commander in European waters from 1917. Sent destroyers to escort British convoys; co-architect of the Northern Barrage of mines and the convoy strategy that defeated the U-boats.
U-9's commander, sinker of three British cruisers. Killed when his next boat, U-29, was rammed by HMS Dreadnought in March 1915 — the first time a battleship sank a submarine.
Disguised armed Royal Navy vessels designed to lure surfaced U-boats. Initially effective but largely defeated by the U-boats' adoption of submerged torpedo attacks. Q-ships sank 14 U-boats while losing 27 of their own.
WWI established the submarine as a strategic, not tactical, weapon. It also established the eternal counter: convoys plus aerial patrols plus active sonar. Both lessons would be re-learned, and re-paid for in blood, between 1939 and 1943.
1939–1945 • Dönitz's Wolf Packs and the Decisive Naval Campaign of WWII
Adm. Karl Dönitz, commander of Germany's submarine arm, designed the Battle of the Atlantic as a tonnage war: sink ships faster than the Allies could build them. With the Type VII U-boat — cheap, mass-producible, with adequate range for the North Atlantic — he organized "wolf packs" of 8–20 boats coordinated by radio to converge on Allied convoys. The campaign reached its peak in March 1943, when wolf packs sank 120 ships in a single month and Britain considered the convoy system might fail. The decisive turn came that May: Allied very-long-range air patrols closed the mid-Atlantic gap, escort carriers gave constant air cover, the Hedgehog and Squid anti-submarine weapons came into service, and Bletchley Park's Enigma cryptanalysis matured. In May 1943 alone, Germany lost 41 U-boats. Dönitz withdrew from the Atlantic. By the end of the war, three of every four U-boat crewmen had died. Their cause was lost; their lethality was unforgettable.
1891–1980 • Hitler's named successor as Reich President, May 1945
Dönitz served on U-39 in WWI and was captured in 1918. He spent the inter-war decades formulating the wolf-pack doctrine. Promoted to Grand Admiral and commander of the Kriegsmarine in January 1943; named Hitler's successor at the Führer's suicide in April 1945. Tried at Nuremberg, sentenced to 10 years for unrestricted submarine warfare but acquitted of crimes against humanity (in part because U.S. Pacific Fleet practice had been identical).
Bletchley Park's Naval Section. Turing's bombe-machine improvements broke Naval Enigma's "shark" cipher in December 1942. The intelligence saved roughly 14–21 million tons of Allied shipping over the war.
RAF Coastal Command's first WWII chief. Pushed for very-long-range Liberator bombers to close the mid-Atlantic gap. The decision — finally implemented in March-April 1943 — was decisive.
U.S. Chief of Naval Operations. Initially refused British convoy advice, costing 600+ ships in early 1942. Reversed course only after April; "Drumbeat" became the costliest U.S. naval episode of the war.
Top-scoring U-boat ace: 47 ships, 274,418 tons. Captured March 1941 when U-99 was sunk. Spent the rest of the war in Canadian POW camps; later rejoined the postwar Bundesmarine and retired as Konteradmiral 1970.
The peak of submarine campaigns of all time. Allied U.S. submarine operations against Japan in the Pacific (1941–1945) achieved similar success — sinking 55% of Japan's merchant fleet — with one-tenth the U.S. submarine losses, because Japan never adopted convoys. The U-boat war's lessons (radar, sonar, air gap, code-breaking) shape every modern anti-submarine doctrine.
Groton, Connecticut, January 21, 1954 • "Underway on Nuclear Power"
USS Nautilus (SSN-571), commissioned September 30, 1954, was the world's first true submarine: a vessel that could remain submerged indefinitely, limited only by food and crew endurance. Her predecessors had been submersibles — surface ships that could dive briefly. Nautilus's S2W pressurized water reactor, designed under Capt. Hyman G. Rickover, made the entire pre-1954 anti-submarine doctrine of forcing submarines to surface to recharge batteries irrelevant overnight. On August 3, 1958, she became the first vessel to reach the geographic North Pole, transiting beneath the polar ice cap. She was decommissioned in 1980 after 25 years of service and is now a National Historic Landmark museum at Groton, Connecticut. Every nuclear submarine on Earth descends from her.
1900–1986 • Polish-Jewish immigrant, four-star admiral
A Russian-Polish immigrant who graduated from the U.S. Naval Academy in 1922. Took over the Atomic Energy Commission's naval reactor branch in 1948 and became the most uncompromising program manager in naval history. Personally interviewed every nuclear-submarine officer for the next 30 years. Forced through Congress, against repeated dismissal recommendations, an unprecedented 60-year active-duty career (1922–1982).
First commanding officer. Later commanded the world's first nuclear-powered guided-missile cruiser, USS Long Beach. His "underway on nuclear power" message became one of the famous quotations in U.S. naval history.
Second commanding officer. Took Nautilus under the polar ice in Operation Sunshine. Later a U.S. Congressman from Tennessee (1965–1973) and prominent advocate for nuclear naval propulsion.
The Groton, Connecticut shipyard that has built every U.S. attack submarine since Nautilus, jointly with Newport News for some boat classes. Still building Virginia-class subs today.
Designed the S2W reactor under Naval Reactors. Bettis (Pittsburgh) and Knolls (Schenectady) remain the two laboratories that design every U.S. naval reactor today.
The break-point of the entire history. Before Nautilus, every submarine was an obligate surfacer; after, the apex naval predator could remain submerged for the duration of its food supply. The next two eras — SSBNs and modern attack submarines — are direct extensions of her template.
1959–1991 • Polaris, Typhoon, and the Foundation of MAD
A submarine that could carry ballistic missiles offered an attribute no other weapon could: invulnerability. Hidden in the ocean's vastness, it would survive any first strike and deliver retaliation, and the certainty of that retaliation made any first strike irrational. The strategy of mutual assured destruction (MAD) rested on this submerged leg of the nuclear triad. The U.S. commissioned its first ballistic-missile submarine, USS George Washington (SSBN-598), in 1959 and conducted the first Polaris A-1 deterrent patrol in November 1960. The Soviet Union responded with the Yankee, Delta, and finally the colossal Typhoon class — at 175 meters and 48,000 tons, the largest submarines ever built. Britain and France joined; China commissioned its first SSBN in 1981. By 1991 the world's SSBN fleet stood at roughly 65 boats. Their patrols continue uninterrupted today: every minute of every day since November 15, 1960, at least one SSBN of the Western alliance has been on continuous deterrent patrol.
1905–1990 • First Director, Special Projects Office
Took over the U.S. Navy's Special Projects Office in 1955 with a mandate to deliver a submarine-launched ballistic missile in five years. Raborn's PERT (Program Evaluation and Review Technique) project-management system became standard in U.S. defense and aerospace. Polaris A-1 entered service in 1960, ahead of schedule and under budget. He briefly served as Director of the CIA (1965–1966) before retiring.
Soviet Navy Commander-in-Chief 1956–1985. Architect of the blue-water Soviet Navy and its SSBN deterrent. His 28-year tenure made him the longest-serving naval commander of any modern superpower.
First Royal Navy Trident SSBN, in service since 1993. The UK's continuous-at-sea deterrent has not lapsed for a single moment since 1969 — the longest unbroken nuclear vigil of any single nation.
French SSBN class (4 boats since 1997). Carries M51 SLBMs. France maintains a permanent at-sea deterrent independent of NATO command structure — the only NATO SSBN force not under U.S. nuclear release authority.
The Hunt for Red October (1984) introduced the SSBN to popular imagination through the fictional Soviet defection. The Naval Institute Press, which published it, was inundated with manuscripts thereafter.
The strategic apex of the submarine's century. From the Hunley's single torpedo in 1864, through wolf packs in the Atlantic, to a single Ohio-class boat carrying enough warheads to end any nation. The shift from tactical (sinking ships) to strategic (deterring war) is the signature transformation of the submarine.
1990s–present • Multi-Mission Attack Submarines and the Indo-Pacific Pivot
The end of the Cold War left the U.S. with the world's largest, quietest, and most capable submarine force, and a strategic question: what for? The answer arrived in three waves. The Seawolf class (3 boats, 1997–2005), originally conceived to hunt Soviet boomers, became a "silver bullet" for special operations under the Arctic. The Virginia class (24+ boats, 2004–present, 30+ planned) is a multi-role workhorse: Tomahawk strike, anti-submarine, anti-surface, intelligence, and SEAL delivery. Britain's Astute class (7 boats, 2010–present) is the Royal Navy's equivalent. France's Suffren-class Barracudas, India's Arihant program, and China's expanding Type 093 and 094 fleets round out a global resurgence in attack-submarine investment. The September 2021 AUKUS pact (Australia, UK, U.S.) commits to delivering Australian-flagged nuclear attack submarines — the first nuclear submarines for any non-nuclear weapons state, and a marker of the Indo-Pacific's emergence as the central theater of 21st-century naval competition.
U.S. President Biden, UK PM Johnson, Australian PM Morrison
Announced jointly on September 15, 2021. Australia withdraws from a $66 billion contract with France's Naval Group for diesel-electric submarines and instead commits to acquiring nuclear-powered attack submarines. Initial Virginia-class boats from the U.S. (early 2030s), then a new SSN-AUKUS class jointly designed with the UK from the late 2030s. France recalls its U.S. and Australian ambassadors in protest.
U.S. workhorse attack submarine. As of 2026, ~24 commissioned, 30+ planned. Newest boats incorporate Virginia Payload Module: 28 additional Tomahawk vertical launch tubes for land-strike emphasis.
Royal Navy attack submarine, 7 boats. Acoustic signature reportedly the lowest of any British submarine. Successor SSN-AUKUS will be larger, jointly built with Australia using U.S. technology transfer.
People's Liberation Army Navy attack submarines. Type 093 in service since 2007; Type 095 reportedly entering production. Reduce the U.S. submarine acoustic-advantage gap that has defined the post-Cold War balance.
Indian SSBN program. INS Arihant commissioned 2016, INS Arighat 2024. India joined the SSBN club, completing its nuclear triad. A Project 75-Alpha SSN program is in early development.
The era's defining feature is convergence: the missions that were once distinct (attack, strike, intelligence, special forces, anti-submarine) now sit on the same hull. The era's defining geopolitical fact is that submarine investment is again concentrated where naval competition is sharpest — the Indo-Pacific — mirroring 1939 Atlantic and 1965 North Atlantic before it.
| Era | Years | Key Vessel | Propulsion | Major Action | Outcome | Type |
|---|---|---|---|---|---|---|
| Hunley | 1863–1864 | H.L. Hunley | Hand crank, 8 men | Sinks USS Housatonic | Lost with all hands | Manual |
| WWI U-boats | 1914–1918 | U-9, U-20 | Diesel-electric | Lusitania (1915), tonnage war | Strategic defeat by convoys | Diesel |
| WWII U-boats | 1939–1945 | Type VII, IX, XXI | Diesel-electric | Battle of Atlantic, wolf packs | 73% submariner casualties | Diesel |
| Nautilus | 1954–1980 | USS Nautilus | S2W reactor | First nuclear, polar transit 1958 | Foundation of nuclear navy | Nuclear |
| Cold War SSBNs | 1959–1991 | Ohio, Typhoon, Vanguard | Naval reactor | Continuous deterrent patrols | MAD; Cold War ended bloodless | Nuclear |
| Modern SSNs | 1990s– | Seawolf, Virginia, Astute | Naval reactor | Multi-role, AUKUS pact 2021 | Indo-Pacific renaissance | Nuclear |
From the Hunley (cheap iron cylinder vs. 1,200-ton cruiser) to the Virginia (a $3.5B boat versus a $13B aircraft carrier), submarines have consistently delivered lethality at a fraction of their target's cost. The asymmetry has driven every navy's investment decisions.
Britain learned convoying late in 1917, then forgot it by 1939. The U.S. ignored convoying in early 1942 with disastrous results. The lesson: ASW depends on aerial coverage, escort density, and convoying simultaneously — never just one.
Dönitz's calculation that sinking exceeds replacement was correct in principle. It failed in practice because U.S. shipyards launched a Liberty ship every four days at peak; replacement always exceeded sinkings after April 1943.
WWI/WWII subs were tactical (sink ships). SSBNs are strategic (deter war). Modern SSNs are both: strike land targets, hunt ships, gather intelligence. The same hull form fulfills missions Holtzendorff would not have recognized.
Submarine concentration mirrors strategic competition. WWII U-boats mirrored Atlantic supply lines; Cold War SSBNs mirrored the Atlantic and Arctic theaters; AUKUS mirrors the Indo-Pacific. Where naval rivalry intensifies, submarines proliferate.
Submariner casualty rates have always been high: Hunley 100%, WWII Kriegsmarine 73%, U.S. Pacific WWII 22%. Modern SSN losses since 1955 are remarkably low (4 USN, 5+ Russian, 1 PLAN), reflecting depth of training and engineering quality.
Drag to pan • Scroll to zoom • Hover for details