well I'd think Remi didn't too far out before it broke under her. Unless you wan to say she'll be in way over her head LH. Luckily I think one can hold their breath for rounds equal to their con SCORE. at least in PF.<br/><br/>Ok kn 5e: she can basically pull a str-check each round to swim at 15 spd or so. unless she has something she can grab onto.  she can swim underwater for like 3 minutes. (1+con mod)