We did a dive in high current, with instructions to get down to 60 feet as quickly as possible. So I was already that deep before trying to turn on the camera and discovering water drops inside the housing. By the time I could surface, it was already half-full of water. I'm not sure exactly what caused the flood. I'm suspicious that it might have been the vacuum port, but we were unable to determine for sure. The main o-ring was damaged by the time it got back to Backscatter, but I quit taking much care with the housing following the flood and the damage easily could have happened afterwards.
This is the Aquatica vacuum system.
Insurance paid for replacing the camera and lens, and overhauling the housing. I'm just back from my first dive trip since the flood. Things worked OK, but I am still unhappy with this housing.
The strobe cables inside the housing can very easily come unplugged. I had one dive without functioning strobes, and twice more where my pre-dive check discovered that they wouldn't fire, so I had to open the housing, fix the cables, and re-seal it.
With the door hinged so that it barely opens more than 90 degress, one time the door slammed shut while I was working on the housing, chipping the plastic latch. It still works for now, but I can imagine that breaking it beyond repair.