I’m so proud of this little device. I’ll be testing it this weekend in a nearby creek but I think it will be awesome to use in an ocean, lake, or pool. It’s mostly PVC pipe, 1 long screw, a couple of hex locknuts, a washer, and a tire that I found in a creek last week! The GoPro will mount to the screw using the GoPro tripod adapter and can be used right side up or upside down. Underneath I used a PVC pipe that allows line to go through it in case you want to pull it back to you, or attach small weights to give it more stability. That part hasn’t been tested yet.