Cable ops · South Atlantic Ocean surge 83 305 9 149 252× / 0.33 Cable ops · North Atlantic Ocean surge 20 219.5 3 59 20× / 1 Surveys · North Sea surge 16 108 3 69 16× / 1 Incidents · North Pacific Ocean surge 15 98 2 68 5.0× / 3 Cable ops · North Sea surge 9 66.1 1 45 4.5× / 2 Quakes · South Pacific Ocean 9 32.9 0 — 0.9× / 9.67 Nav aids · South Atlantic Ocean surge 8 210.9 8 180 3.4× / 2.33 Nav aids · North Sea surge 8 103.6 4 164 4.8× / 1.67 Quakes · Banda Sea surge 8 24 0 — 12× / 0.67 Surveys · Celtic Sea surge 8 20.6 0 — 2.2× / 3.67 Surveys · English Channel surge 8 20.3 3 12 24× / 0.33 Exercises · North Pacific Ocean surge 7 42.7 0 — 10× / 0.67 Quakes · North Pacific Ocean 7 21 0 — 1.3× / 5.33 Cable ops · English Channel surge 7 15.8 0 — 21× / 0.33 Incidents · Coral Sea surge 7 13 1 22 4.2× / 1.67 Incidents · South Atlantic Ocean surge 6 71.6 2 37 2.0× / 3 Incidents · North Atlantic Ocean surge 6 68.5 1 64 4.5× / 1.33 Missiles · North Pacific Ocean surge 6 62 2 35 3.6× / 1.67 Quakes · Philippine Sea surge 6 22.1 0 — 3.6× / 1.67 Surveys · Irish Sea and St. George's Channel surge 6 17.5 1 25 2.6× / 2.33 Nav aids · South Pacific Ocean surge long running 5 174.2 6 390 3.8× / 1.33 Exercises · Aegean Sea surge 5 106.4 3 242 15× / 0.33 Incidents · Indian Ocean surge 5 36.3 2 46 5.0× / 1 Exercises · North Atlantic Ocean surge 5 26 1 24 5.0× / 1 Containers · Mediterranean Sea - Eastern Basin new 5 20.7 0 — new / 0 Nav aids · Celtic Sea surge 5 12 0 — 5.0× / 1 Cable ops · Eastern China Sea surge 4 110.7 4 94 6.0× / 0.67 Exercises · Black Sea surge 4 42.9 1 29 12× / 0.33 Icebergs · South Atlantic Ocean 4 26.5 0 — 1.5× / 2.67 Nav aids · Irish Sea and St. George's Channel surge 3 96.9 2 120 3.0× / 1 Cable ops · Persian Gulf surge 3 67.2 3 77 9.1× / 0.33 Nav aids · Tasman Sea surge long running 3 64.3 3 380 4.5× / 0.67 Incidents · Philippine Sea new 3 50.4 1 58 new / 0 Surveys · Red Sea new 3 29.4 0 — new / 0 Incidents · Persian Gulf new 3 16.6 1 16 new / 0 Exercises · Adriatic Sea 3 10.3 0 — 0.6× / 4.67 Quakes · Coral Sea 3 10.3 0 — 1.5× / 2 Exercises · Tyrrhenian Sea new 3 10.3 0 — new / 0 Exercises · Mediterranean Sea - Western Basin surge 3 9.9 0 — 3.0× / 1 Nav aids · Persian Gulf new 3 8.4 1 26 new / 0 Surveys · Mediterranean Sea - Eastern Basin surge 3 3.8 2 2 9.1× / 0.33 Nav aids · English Channel 3 1.8 0 — 1.8× / 1.67 Incidents · Mozambique Channel new 3 0.7 0 — new / 0 Nav aids · North Pacific Ocean new 2 85.2 3 170 new / 0 Incidents · South Pacific Ocean 2 64.1 2 47 1.2× / 1.67 Nav aids · Mozambique Channel new 2 57.4 2 52 new / 0 Surveys · South Atlantic Ocean new 2 43.3 1 24 new / 0 Surveys · Mediterranean Sea - Western Basin 2 42.2 1 38 6.1× / 0.33 Ordnance · North Atlantic Ocean 2 41.5 0 — 6.1× / 0.33 Spills · North Atlantic Ocean 2 28 0 — 1.2× / 1.67 Cable ops · Celtic Sea 2 24.8 0 — 2.0× / 1 Nav aids · Arabian Sea 2 24.3 1 22 6.1× / 0.33 Derelicts · Celtic Sea new 2 21.1 1 14 new / 0 Derelicts · North Atlantic Ocean new 2 17.9 0 — new / 0 Debris · North Atlantic Ocean new 2 15.5 0 — new / 0 Derelicts · North Pacific Ocean new 2 13.8 0 — new / 0 Containers · Philippine Sea new 2 13.2 0 — new / 0 Exercises · South Atlantic Ocean new 2 9.6 0 — new / 0 Exercises · Sea of Okhotsk new 2 9.2 0 — new / 0 Quakes · Indian Ocean 2 6 0 — 1.0× / 2 Quakes · Solomon Sea 2 6 0 — 1.5× / 1.33 Quakes · South Atlantic Ocean 2 6 0 — 1.2× / 1.67 Other · North Pacific Ocean new 2 5.7 0 — new / 0 Exercises · Mediterranean Sea - Eastern Basin 2 5.4 0 — 6.1× / 0.33 Exercises · Ionian Sea 2 4.2 2 3 1.2× / 1.67 Other · North Atlantic Ocean 2 2.9 0 — 1.5× / 1.33 Ordnance · Eastern China Sea new 2 2.4 0 — new / 0 Nav aids · Great Australian Bight new 2 1.6 0 — new / 0 Ordnance · Adriatic Sea long running 1 218.1 7 447 3.0× / 0.33 Nav aids · Tyrrhenian Sea 1 98.1 3 180 0.6× / 1.67 Wrecks · North Sea 1 97.6 4 289 new / 0 Nav aids · North Atlantic Ocean 1 93.5 3 109 0.3× / 3.33 Other · South Atlantic Ocean 1 60.4 2 100 3.0× / 0.33 Cable ops · Adriatic Sea 1 53.4 2 40 new / 0 Wrecks · Red Sea 1 47.4 2 114 new / 0 Cable ops · Mediterranean Sea - Eastern Basin 1 42.3 1 174 new / 0 Other · Red Sea long running 1 42 1 1,728 new / 0 Ordnance · Tyrrhenian Sea 1 34.3 2 301 3.0× / 0.33 Incidents · Arabian Sea 1 33.9 1 51 new / 0 Nav aids · Inner Seas off the West Coast of Scotland long running 1 33.4 1 469 0.8× / 1.33 Nav aids · Adriatic Sea long running 1 32 1 527 3.0× / 0.33 Surveys · Tyrrhenian Sea 1 31.3 0 — 3.0× / 0.33 Cable ops · South China Sea 1 31 1 56 new / 0 Incidents · South China Sea 1 25.1 1 74 3.0× / 0.33 Incidents · Ligurian Sea 1 23.1 1 23 new / 0 Incidents · Sea of Okhotsk 1 22 1 22 new / 0 Cable ops · Bass Strait 1 21.7 1 21 new / 0 Nav aids · Indian Ocean 1 18.2 1 18 1.5× / 0.67 Other · Mediterranean Sea - Eastern Basin 1 17.5 0 — new / 0 Nav aids · Mediterranean Sea - Eastern Basin 1 16.3 1 16 new / 0 Cable ops · South Pacific Ocean 1 15.4 0 — new / 0 Spills · Caribbean Sea 1 14 0 — new / 0 Nav aids · Red Sea 1 11 0 — 3.0× / 0.33 Other · Greenland Sea 1 8.5 1 8 new / 0 Surveys · Ligurian Sea 1 8.3 0 — new / 0 Derelicts · Caribbean Sea 1 6.8 0 — 3.0× / 0.33 Debris · Arafura Sea 1 6.5 0 — new / 0 Debris · Caribbean Sea 1 6.1 0 — new / 0 Derelicts · Eastern China Sea 1 6.1 0 — new / 0 Spills · Gulf of Mexico 1 5 1 44 0.6× / 1.67 Cable ops · Inner Seas off the West Coast of Scotland 1 5 0 — new / 0 Exercises · Japan Sea 1 4.9 0 — new / 0 Ordnance · Yellow Sea 1 4.5 0 — new / 0 Surveys · North Atlantic Ocean 1 4.3 0 — 0.3× / 3 Ordnance · Indian Ocean 1 4.1 0 — new / 0 Derelicts · Tyrrhenian Sea 1 3.3 1 3 new / 0 Quakes · Bay of Bengal 1 3 0 — new / 0 Quakes · Caribbean Sea 1 3 0 — new / 0 Quakes · Gulf of Tomini 1 3 0 — 3.0× / 0.33 Quakes · Japan Sea 1 3 0 — new / 0 Quakes · Molukka Sea 1 3 0 — 1.5× / 0.67 Cable ops · Irish Sea and St. George's Channel 1 2.9 1 2 new / 0 Wrecks · South Atlantic Ocean 1 2.3 1 2 new / 0 Exercises · Bay of Bengal 1 2 0 — new / 0 Exercises · Gulf of Aden 1 1.7 1 1 new / 0 Ordnance · Japan Sea 1 1.7 1 1 new / 0 Derelicts · South Atlantic Ocean 1 1.5 0 — 1.5× / 0.67 Derelicts · Coral Sea 1 1 0 — 1.5× / 0.67 Containers · Eastern China Sea 1 1 1 1 new / 0 Surveys · Alboran Sea 1 0.6 0 — new / 0 Quakes · Celebes Sea 1 0.6 1 0 new / 0 Derelicts · Mediterranean Sea - Eastern Basin 1 0.5 0 — new / 0 Ordnance · Persian Gulf 1 0.3 1 0 new / 0 Nav aids · Coral Sea long running 0 124 4 441 0.0× / 1.67 War risk · Persian Gulf 0 124 4 210 — / 0 Nav aids · Gulf of Suez 0 93 3 121 0.0× / 0.67 Wrecks · South China Sea 0 93 3 226 — / 0 Other · North Sea long running 0 66.3 2 490 0.0× / 2.33 Other · Adriatic Sea long running 0 62 2 1,354 — / 0 Surveys · Adriatic Sea long running 0 62 2 531 0.0× / 0.33 Wrecks · English Channel long running 0 62 2 428 — / 0 Wrecks · Kattegat 0 62 2 155 — / 0 Nav aids · Malacca Strait 0 62 2 321 — / 0 Volcanic · North Pacific Ocean long running 0 62 2 580 — / 0 Mines · North Sea long running 0 62 2 904 — / 0 Wrecks · Persian Gulf 0 62 2 66 — / 0 Other · South Pacific Ocean 0 62 2 116 0.0× / 0.67 Wrecks · South Pacific Ocean 0 62 2 118 — / 0 Wrecks · Tyrrhenian Sea long running 0 62 2 679 — / 0 Cable ops · Japan Sea 0 33.6 1 55 — / 0 Wrecks · Adriatic Sea 0 31 1 199 — / 0 Wrecks · Arabian Sea 0 31 1 55 — / 0 Nav aids · Bay of Bengal 0 31 1 331 — / 0 Surveys · Bay of Biscay 0 31 1 37 — / 0 Nav aids · Caribbean Sea 0 31 1 118 — / 0 Wrecks · Coral Sea 0 31 1 94 — / 0 Incidents · Eastern China Sea 0 31 1 45 — / 0 Other · Gulf of California 0 31 1 157 — / 0 Nav aids · Gulf of Mexico 0 31 1 99 — / 0 Other · Gulf of Mexico 0 31 1 157 — / 0 Other · Gulf of Oman 0 31 1 35 — / 0 Wrecks · Irish Sea and St. George's Channel 0 31 1 59 — / 0 Wrecks · Makassar Strait 0 31 1 50 — / 0 Wrecks · North Atlantic Ocean long running 0 31 1 450 — / 0 Surveys · North Pacific Ocean 0 31 1 159 0.0× / 0.67 Nav aids · Philippine Sea 0 31 1 48 — / 0 Surveys · Sea of Okhotsk 0 31 1 38 — / 0 Other · South China Sea long running 0 31 1 373 0.0× / 0.67 Structures · South China Sea long running 0 31 1 414 — / 0 Towing · South China Sea 0 31 1 40 — / 0 Nav aids · Timor Sea 0 31 1 219 — / 0 War risk · Adriatic Sea 0 25.2 0 — — / 0 Exercises · Norwegian Sea 0 20 0 — — / 0 Incidents · English Channel 0 10.4 0 — — / 0 Other · Indian Ocean 0 10.3 0 — — / 0 Other · Malacca Strait 0 10.3 0 — — / 0 Derelicts · South Pacific Ocean 0 5 0 — 0.0× / 0.33 Spills · North Pacific Ocean 0 1 0 — 0.0× / 1 Icebergs · Indian Ocean 0 0 0 — — / 0