HMS Triumph travelled from Clyde naval base to Devonport, where it will soon retire from service after more than 20 years

It took "multiple attempts" before the tide was low enough under the cliffs at Buckton.

ABP announces a masterplan to increase capacity as part of an international agreement.

The private submersible industry was shaken after the implosion of the OceanGate Titan sub last year.

The UK's nuclear deterrent failed to fire a test missile reportedly landing close to the launch site.

The USS Jacob Jones was the first US Navy destroyer to be lost to enemy action.

An unnamed Vanguard class submarine's depth gauge failed in an incident that happened more than a year ago.

Named after a mythical massive fish, the Haikun is Taiwan's first domestically made submarine.