Several weeks back a few US navy vessels were waylaid with Covid-19 in the crew. I have not heard of any recent updates to the story. % of total crew infected, deaths per ship personnel, anything? They were spoken of as being great petri dishes for data on community spread at the time IIRC.
The most well-known case is that of the USS Theodore Roosevelt
Executive summary - The outbreak began in onboard in March, eventually about 1000 (out 4,500) tested positive. Several sailors were hospitalized, and one tragically lost his life. There was a brouhaha over how the captain handled it.
So in this case, one in four got infected. The rate obviously reduced by the crew getting off the ship and ashore in isolation. And of the thousand+ infected, one died.