Das kann doch den ersten Seelord nicht erschüttern
What are they singing??
"wie gerne Churchill uns blockiert, - you see it looks no black -,
das Deutsche U-boot torpediert, in seinem frühstück speck"
This is a parody of "Das kann doch einen Seemann nicht erschüttern" (a great sailor song by itself) and has something to do with Prien sinking Royal Oak, but I don't know enough German to give you any more information.
Anyways I love it when the officers in the video play with cardboard models of ships and draw with a chalk a torpedo hitting and exploding
