Just chiming in on this thread. I see no-one has posted for a while. BlueROV team: are you anywhere nearer to providing a quick disconnect solution or do we still need to go with a DIY option? Would you endorse any of the suggestions provided in the above thread over another? Many thanks!
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Any updatew on this from blueroboitcs for quick disconnect solution?
If you are able to terminate your own tether, these guys manufacture bulkhead connectors that have worked well for us.
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Any updates on a tether disconnect? Thats probably my biggest change I would make. Having the ROV permanently connected to 1000 ft of tether is a pain when transporting. A quick disconnect would be so much better!
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As is clear from this thread’s history, this has been a longstanding request, and is definitely a useful functionality.
I can’t provide a timeline at this stage, but we are actively working on development and testing of connectors at the moment, and the tether is one of the first candidates for connectorisation 
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We’ve been using Suburban Marine Baromax for the tether disconnect (washdown) and Cobalt connectors for ethernet / signal (keep dry). Expensive as you say… But works well.
We are using the Blue Trail Engineering connectors. Great quality. Doing the cable termination process is a little tricky but having a tether that can easily disconnect is VERY nice!
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I use Blue Trail Cobalt connectors. Works great.
I find them my solution.
Someone on homebuiltrovs.com (I think) posted a build of a disconnect made from ABS plumbing parts, compression fit. I found it worked best when assembled submerged in a pan of mineral oil, so the water cannot force itself into an empty cavity. Same thing I fill my servos with, to prevent water ingress.