Thanks for asking. The SOLAS rules are quite clear but IMO discusses them and issues Guidelines how to interpret them all the time. See http://heiwaco.com/news86.htm how I see it!
What is no clear to me is how a collision producing underwater, small, structural damages and up-flooding of one accommodation/equipment compartment well ahead of the Fitz four engine rooms could cause complete black-out and loss of power on the ship. We are told the warship has no watertight doors in the bulkheads, so how could sea water progressively flood the engine rooms?
That Fitz crew members drowned in the up-flooded compartment is probably due to defective escape arrangements. They were trapped and couldn’t get up/out in the dark.
But I agree, last time I crept through destroyers in dry dock was 1970. Do they have bilge pumps or is pumping by hand by sailors?