Extending PX4's Underwater Robot Support

Hi Daniel.
I’m using Px4 1.10 and this is exactly what I am trying to do… disassociate MC for use in an underwater drone, though I seem to be quite a few steps behind you. So glad to hear that I’m not the only one working on this. I have had a hard time getting HippoCampus to work in any regard and was beginning to wonder how much support for it PX4 actually has. As a result, I’ve been compiling as a quad copter and trying to modify PX4 starting from there. When I run make list_config_targets, I don’t see a way to build HippoCampus (which is why I went back to the drawing board and tried to start with a copter configuration.) Can you point me a better direction? How can I make use of anything that’s already part of PX4 for underwater drones? Any help would be greatly appreciated.

Thanks,
Steve