Dean, I would think that making the tether releasable from the sub, in case the line got entangled with some thing nasty, would be a good safety feature. The part I find the trickiest with doing that is having a non corroding releasable connection for the radio(s). I've been thinking about that sort of thing lately with regards to having releasable battery pods, as back-up to the primary drop weights, like I've seen on a few subs in the Busby book. Having good releasable electrical connections is one of the biggest challenges I see in doing that. Regards, Brent
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