Since you were originally going with "Deep Water" I think it's only appropriate to stick that theme but to take it a step further.
Therefore, I propose "Deep Blue Sea" as it perfectly encapsulates all the best qualities in this beautiful creation, and furthermore, invokes memories of the 1999 classic, Deep Blue Sea starring LL Cool J and Samual L Jackson.
This movie is a real gem, and one quite possibly one of the most underrated movies of all time. Where else would you go for genius, killer sharks battling the legend Samual L? Easily puts Snakes On A Plane to rest. I mean come on.
Thanks for the good times & good luck all!!