Everything is appalling, so here are some stories about the Navy's Coastal Forces (Motor Gun Boats and Motor Torpedo Boats) in WW2.
These small vessels had very powerful engines which were complex and hard to maintain.
As a result, base engineering staff sometimes had to remain on board to continue their work during operations.
On one occasion, an Engineering Officer was labouring in the machinery space when the boat went into battle.
Not having seen one before, he opened the hatch to look around. Every gun was in action, and enemy tracer zipped past his head. The noise was appalling.
The officer (unnamed in the story, but perhaps a nautical Wooster) took in the scene for a moment, then turned to the CO and remarked, 'Oh I say! Madly *war*, isn't it?', before returning to his tinkering.
During the raid on Dieppe an MGB picked up a German airman, who was sent below under armed guard.