I’m building several small electronics tubes to attach to the BlueROV2, and would like to connect them via Ethernet to the main electronics tube. My plan is to use something akin to Cat5 with passive PoE. I’ve read the various discussions here, but they’re mostly focused on the tether, where tensile strength is a key consideration, and buying by the spool makes sense. I’m looking for something good enough to submerge to 100m. RJ45 connectors would be a bonus. Strictly speaking I don’t need 4 twisted pair for passive PoE: 2 twisted pair plus 2 power wires will be enough. I’m a bit bewildered by the choices in cables, and I don’t really need 100’s of feet. I imagine that somebody must have done this before… any pointers?