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Originally Posted by Roguish Lawyer
Eliminate bubbles?
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True but why?? Presumably an infiltration would be done on an isolated site. Normal wind, waves and current will mask most bubbles. The marines in Danang had a good anti-swimmer program. Periodically and randomly they droped grenades off of the bridge into the river. Bubbles or no bubbles the swimmer is coming up. If you are operating in an area where seeing bubbles may compromise you, you may not want to be there.
Believe me, towing infiltration gear while breathing 100% oxygen can quickly lead to hypoxia.
I can see closed circuit as a breathing source in mini subs as Pete said. The new mixed-gas rigs are meant for deep diving and work. Admittedly all I swam were the Emerson and LARU -- talk about FOGdom. We didn't swim the LARU, it was a rescue breather meant for ascents from sidabled subs. We "got" to try it at the Navy tower -- just for "fun".
To me closed circuit is good for macho war stories in the bar!! Admittedly my opinion. It was really a confidence builder or destroyer rather than a practical means of infil.
I used to teach para-SCUBA in Panama. It was fun but no body has yet given me a practical use for para-SCUBA other than to say you did it. My Tm. Sgt made a HALO Scuba jump and swears that was a first and last.
Personally, I think a good means of beach infiltratio9n would be a high opening, way off shore on a black night and black canopies and a strong onshore wind.
