Yorkshire cave divers use external catheters connected to dump valves - an idea copied from Swiss divers, and used elsewhere I believe. I don't know the precise details of "connection" but double-sided tape is spoken of... Dr. Neal Harman Department of Computer Science University of Wales Swansea Singleton Park Swansea SA2 8PP TEL: +44 792 295394 FAX: +44 792 295708 N.A.Harman@sw*.ac*.uk* http://www.swansea.ac.uk/compsci/AllStaff/NAH.html
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