This is the obligatory argument that captains did not have hull damage percentage gauges in the control room. Often they were guessing how much hidden damage they had and did not find out until they were in drydock what danger they were in.
U-505 was attacked by an aircraft, had muchas hidden damage, which although unknown in specifics, continued to play havoc with boat funcionality until it was captured almost a year later.
That is why if we get a damage gauge, I'm turning it off.
