Hmm I hope not, I already had it at 99,9 meters (328 feet) and have another dive at 194 m coming up, just need to get a longer tether.
I used 3m compound in a homemade mould.
The relay is a 12v car relay, but I had to cut it in half to make it fit behind the electronic tray. Used the original plus wire from the screw terminal and made a new wire from relay to terminal. The px4 gets power before the screw terminal, so had to disconnect two black wires from the px4 power supply and rely on the other power supplies connected to the px4. The switch is connected to negative terminal and relay.
I hope you get the idea…
Sorry for hijacking the thread, intended for slip ring