Hopefully, the batteries won’t blow up.
Puget Sound is not warm. You have to wear a suit to go scuba diving up there even in summer and the water is cold and dark.
In the North Sea between the UK and Norway that sea will kill you if you go in without a survival suit and flotation. In the winter about 3 minutes, in the summer maybe 30 minutes. But you will die. As your body cools the natural reaction is to shunt blood to central organs and the brain. You loose function of your arms and legs and drown. Fortunately you may be unconscious. (North Sea Oil Rig worker in the 70s and early 80s.) I miss it all dearly but today it is just an old man's fond memories. The North Sea was good and bad and tragic. Google "Alexander Kieland sinking." I was on it a few months before it went down. It took some of my friends.