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An interesting VW I saw in San Diego. It is a VW pointer, and appears to be a Mexian model, since this is not a US production model. Plus it has Mexi plates :)
I got tired of trying to point out little tiny critters to my dive buddies using a flashlight beam. So, I designed and constructed an underwater laser pointer.
The housing is standard PVC. The front endcap has a disc of plexi slilconed into it. The body tube buts up against the silicone, and is PCV-glued into the endcap. The rear endcap is a standard screw fitting. I tested it to 60 feet deep with nothing but teflon tape and there were no leaks, but I put some silicone in the threads for good measure (I can use strap wrenches to open it up when I need to change batteries).
For the guts, I used a higher-end laser pointer (The dollar-store crap is just too weak for underwater use). I removed the laser module and inserted it into a smaller-diameter PVC tube as a chassis, and replaced with momentary pushbutton switch with magnetic reed switch, glued into a slot in the inner PVC.
I salvaged a battery holder from an LED flashlight that holds 3xAAA batteries, and glued this to the back of the inner PVC. This has the same voltage as the 3xLR44s that were in it initially, while ensuring lots more mAH of power.
Before the rear endcap was put in place, a section of larger PVC with a section removed to allow it to flex was fitted with a rare-earth magnet, and the location of the reed switch was noted with permenant marker on the body tube. Turning the ring with the magnet turns the unit on and off. Thus far, I've had it down to 100+ feet, and no leaks!