just made my sub explore my bathtub! For this first test I used a 40MHz transmitter and reciever.
I had a small leak of water since I used some 3D printed penetrators for testing purposes (Didn’t want to ruin a metal penetrator for my first test). I think water entered for two reasons: first because the penetrator was 3D printed with PLA, second because I used hot glue and wax to seal the cables to the penetrator.
Here is a short compilation and the bathtub test: