Lt Cdr Molyneux, aged 36 from Wigan, was the Weapons Engineering Officer for HMS Astute.
Gillian Molyneux, Lt Cdr Molyneux's wife, said:
"Ian was utterly devoted to his family. Everything he did was for us. He was very proud to be an officer in the Royal Navy Submarine Service. He will live on in our four beautiful children."
Captain Phil Buckley, Captain of the Faslane Flotilla to which HMS ASTUTE belongs, said:
"Ian Molyneux was a thoroughly professional and competent submarine engineer and a great asset to HMS Astute and the Royal Navy's Submarine Service.
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