7. Australian Collins Class
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.
8. Dutch Walrus Class
Dutch naval engineering brilliance is best shown by the Walrus-class submarines. Advanced hull designs for both deep ocean and coastal operations define these boats. Their fight system integration offers better weapons control and target monitoring. Regular updates made possible by the modular structure of the class help to keep technological relevance. Their low acoustic signature and great mobility help them to be quite successful in anti-submarine warfare.