This is a version of Open Camera that adds support for the Kraken Sports Smart Housing, which is an underwater housing for smart phones. Visit www.krakensports.ca for more info.
Open Camera is a full featured Android camera app that provides as much functionality as possible, depending on hardware support on specific phones. In particular, it lets you adjust exposure, ISO settings, and manual focus, which are all very useful under water.
Make sure you enable the "Use Camera 2 API" switch in the app settings if your phone supports it, and of course, use the "Remote control" setting to select your Kraken Smart Housing.
Note: Open Camera asks for permissions as it goes along, make sure that you visit all options (in particular, both Photo and Video), so that you do not end up with a permission prompt while underwater. HDR will also display a dialog at first use, make sure you clear it before your first dive.
If you like Open Camera, consider purchasing the donation version from the original author! This version was released with the agreement of the author of Open Camera, and the source code can be found at https://github.com/elafargue/opencamera-ble . It should eventually become part of the official Open Camera distribution.