There are some cameras that were made specifically for being used underwater for example the SeaLife DC1400. But, just from reading the mixed bag of customer reviews on Amazon, it’s clear that it’s not the best underwater camera for scuba diving. The buttons stick, the flash doesn’t work, the shutter delay is insanely slow… just a few of the problems you can run into.
The Olympus TG series has a sterling reputation among the tough camera market, not only for being sufficiently specced to handle tough conditions, but also equipped with impressive imaging and video tech. The Raw-shooting, 4K-capable TG-6, is a fairly minor upgrade on the previous TG-5, but adds some nifty new features like improved LCD resolution and a new Underwater Microscope mode for getting in close. Producing 4K video at 30fps and offering the option to shoot Full HD video at 120fps for super-slow-motion, the TG-6 also has a generous 25-100mm optical zoom lens that lets you get closer and closer to the action. It's got a chunky handgrip providing a secure hold on the camera, while the internal zoom mechanism means the lens never protrudes from the body, protecting it from knocks and bumps. Straightforward but sophisticated, the TG-6 is quite simply the best waterproof camera around right now.