There is now a video that goes through how to assemble the MV72 cable connection. This is the companion to the written documentation available here. Following this guide will help ensure your camera is able to meet it's IP67 rating for the prevention of water ingress.
Haha now I want the MV72 Bathtub Cam to be a thing
Or maybe, for privacy reasons, it should be an Aquarium Cam...
If putting a camera in a bucket of water isn't standing behind your product then I dont know what is!