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A comment on The cave divers who went back for their friends. Parent comment

Re:The cave divers who went back for their friends by gaius on Monday May 09, 2016 @06:20AM (#11658679)
Light signals. You can say 3 things over any distance, which are "OK" (as a question or a response), "attention please" and "OMG OUT OF GAS NEED HELP IMMEDIATELY".
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Re:The cave divers who went back for their friends by Piskvorrr on Monday May 09, 2016 @06:35AM (#11658735)
Given clear visibility, which gets rarer and rarer with distance - and even more so in constrained spaces, which are unlikely to be pure bedrock. Also, line of sight.
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Re:The cave divers who went back for their friends by gaius on Monday May 09, 2016 @06:37AM (#11658746)
Indeed. So you see operating a ROV like that is a non-starter.
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Re:The cave divers who went back for their friends by Piskvorrr on Monday May 09, 2016 @10:20AM (#11660014)
I never said otherwise; are you sure you are not replying to somebody else?
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