Topzle Updated: Wikipedia source
An underwater explosion (also known as an UNDEX) is a chemical or nuclear explosion that occurs under the surface of a body of water. While useful in anti-ship and submarine warfare, underwater bombs are not as effective against coastal facilities.
| Test series | Name | Nation | Date (UT) | Location | Bomb depth | Depth of water | Yield | Notes |
| Crossroads | Baker | US | July 25, 1946 | Bikini Atoll, PPG | 50 m (160 ft) | 100 m (330 ft) | 20 kt | Probe the effects of a shallow underwater nuclear bomb on various surface fleet units |
| Hurricane | Hurricane | UK | October 2, 1952 | Monte Bello Islands | 2.7 m (8 ft 10 in) | 12 m (39 ft) | 25 kt | First British nuclear test. Nuclear effects test of a ship-smuggled nuclear bomb at a port |
| Wigwam | Wigwam | US | May 14, 1955 | North Pacific Ocean | 610 m (2,000 ft) | 4,880 m (16,010 ft) | 30 kt | A Mark 90-B7 "Betty" nuclear depth charge test to determine specifically submarine vulnerability to deep atomic depth charges |
| 1955 | 22 (Joe 17) | USSR | September 21, 1955 | Chernaya Bay, Novaya Zemlya | 10 m (33 ft) | Unknown | 3.5 kt | Test of a nuclear torpedo |
| 1957 | 48 | USSR | October 10, 1957 | Novaya Zemlya | 30 m (98 ft) | Unknown | 6 kt | A T-5 torpedo test |
| Hardtack I | Wahoo | US | May 16, 1958 | Outside Enewetak Atoll, PPG | 150 m (490 ft) | 980 m (3,220 ft) | 9 kt | Test of a deep water bomb against ship hulls |
| Hardtack I | Umbrella | US | June 8, 1958 | Inside Enewetak Atoll, PPG | 46 m (151 ft) | 46 m (151 ft) | 9 kt | Test of a shallow water bomb on ocean floor against ship hulls |
| 1961 | 122 (Korall-1) | USSR | October 23, 1961 | Novaya Zemlya | 20 m (66 ft) | Unknown | 4.8 kt | A T-5 torpedo test |
| Dominic | Swordfish | US | May 11, 1962 | Pacific Ocean, near Johnston Island | 198 m (650 ft) | 1,000 m (3,300 ft) | <20 kt | Test of the RUR-5 ASROC system |