Hello
what can we use to have the cable removable ? (waht kind of connector)
Hi Deny,
If you’re talking about a quick disconnect solution for the Fathom tether, take a look at this post.
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thanks
i saw 
Hi Deny,
The solution provided by @tritonkeller is the official BlueROV connectorization guide, but to provide another – you can use an M10 threaded wet-mate Subconn Micro Circular bulkhead connector, and refit the tether with the mating wet-mate connector. This has the benefit of being connectible underwater, if that is needed at any point.
M10 threaded wet-mate Subconn Micro Circular bulkheads are kind of hard to come by, though. Hopefully at some point BlueRobotics will just ship with some connectorized tether solution! 
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These Subconn-like connectors work great. Been using them for a few years now. They have M10 threaded bulkhead connecters now too!