It's only graphical, but I think it would add so much tension & dread, especially when combined with the flickering lights and other effects. You have destroyers bearing down on you, the hulls breached but your silent running to avoid detection... and the waters slowly rising.
yes.
Men (and women) of Subsim! Who shall rise to the challenge!? Step forth and show yourselves! And hence, swear an oath... that from this day forth thou shall not rest day or night until the flood waters rise in the compartments of SH4.