Okay, feel free to laugh, but here´s my rather stupid question: I still haven´t found out what exactly the pumps and "tumble dryer" (square box with a circle and a cross) symbols actually indicate

I´m also not sure about how the repair team really works - I was confused when I watched the repair behaviour while having flooding in several compartments:
- some compartments automatically show pump symbols
- others do not, the pump symbol only occures when the repair crew is IN this very comp.
- although I had flooding in the control room, there was no pump symbol available (is there a limited number of pumps?)
- the (German) text message says "Wassereinbruch stoppen" ("stopping flooding") which would mean the timer shows the time you need to stop the flooding - this is not the case, since the timer (ALSO?) shows the time it will take to get the water out of the compartment, which is confusing.
- although the flooding was too heavy to hold the sub in a given depth, I was able to surface by blowing ballast, but I could stay on the surface without sinking (even at 0 knots - does this mean there´s less/ no flooding when surfaced?)
By the way: in the German version the messages "We´ve been detected sir" and "enemy is pinging us" (or whatever it says literally) is still there!
So here are my most urgent questions:
1. What EXACTLY do the pump/"tumble dyer" symbols indicate and what do the figures behind them indicate???
2. Is there a way to find out the difference between the time it takes to "stop flooding" and the time it takes to pump out the water? (or in easier terms: how do i know/estimate when the actual FLOODING will be stopped respectively IF it can be stopped at all?)
3. Is there a limited amount of available pumps?
Thanks in advance, and big thanks to nvdrifter for this great job!!!
Cheers, AS