Compact Underwater Housing Accessories

I recently had the opportunity to dive the latest revise of the venerable Olympus Tough TG line up, the TG-4. This camera is nearly identical to last year’s TG-3, with the addition of capturing RAW files, an additional underwater HDR scene mode and a few software tweaks.
I had brought it along on a whim with a raft of much more powerful cameras. But most of them were delayed when I had to make a fast transfer of flights. So for the first few days of my Solomon Islands trip I relied on it and the Olympus E-M1 I had in my carry on.