The World's 9 Most Successful Conventional Submarines: #7 Will Surprise You

7. Australian Collins Class

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Unbelievably, the Collins-class submarines have outperformed all expectations in spite of early criticism. Particularly in long-range operations, these boats have shown outstanding capability. Developed in association with the US Navy, their combat system integration offers outstanding tactical benefits. Including the very powerful Thomson Sintra sonar arrays, the class boasts the most advanced sonar suite ever fit for a conventional submarine. Their extraordinary endurance and capacity to function in both shallow and deep waters have made them far more capable than navy experts first would have expected.