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on June 21, 2013
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How to know when someone is in trouble in the wate...
From another site [1], it seems as if it monitors the amount of time spent underwater, and is activated if this exceeds a preset amount of time.
[1]
http://www.slate.com/blogs/future_tense/2013/05/28/seal_syst...
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[1] http://www.slate.com/blogs/future_tense/2013/05/28/seal_syst...