If you step inside Alliance, you’ll see she still has almost all her original fixtures and fittings – from the periscope and diesel engines to the ship’s telegraph, the Q-tank valves, the underwater telephone, the galley, the heads (toilets and sinks) and the bunks where the 65 men on board took turns to sleep.

Very little of this equipment is operating any more (although much of it is still in working order) so I was called in to reanimate the submarine with a naturalistic soundtrack, evoking the submarine’s past. I worked very closely with veteran submariners to create the world on board. Submariners from the post-war era relied on sound – and silence – to survive so have a remarkable ability to recall and describe sonic details, right down to the pitch of a propellor. Over many weeks, through trial and error, we piece together a soundworld which faithfully reflected their memories.