Sealant for main tether plug connection to ROV

Hello all;

I have a BlueROV2 that I purchased for my work. The other day I was out in the field collecting data and the tether got tangled in the propeller of the vessel and we had to cut it.

My question is, I now need to rewire the tether connect it to the back of the ROV and seal it. What sealant would be adequate for this work? (i.e. to seal the penetrator that attaches to the end cap) I need something that can be easily obtainable, as I live in the Falkland Islands and access to things can be very limited.

Thank you very much all in advance for your help.

Ander