The WP-DC53 Waterproof Case from Canon enables you to shoot underwater with their PowerShot G1 X Mark II Digital Camera. It features a depth rating of 130'. Mechanical controls afford access to virtually all camera functions, and the built-in, flat polycarbonate port with anti-reflective coating accommodates the lens.
The Mark II's built-in, pop-up flash is also usable, and an included diffusion plate softens its light to eliminate backscatter, glare, and hard shadows in your images. Additionally, the case comes configured with a cold shoe mount for accessories, such as an optional lighting arm or an external strobe in a separate housing, which can be connected via fiber-optic cable. You can also use the camera's flash to trigger a strobe as a wireless slave.
Built for durability, the WP-DC53 is constructed from a strong plastic polymer, which is clear to enable you to monitor the waterproof seal and the camera. A neck strap and wrist strap are included, as is a container of silicone grease for O-ring lubrication, which is necessary to maintain the housing's waterproof seal.