Here's a little info on why you have to swim. I don't know how dated this is but most of the other information on the page looks accurate. Take it FWIW.
From the Special Operations Reference Manual.
Quote:
Water Infiltration/Exfiltration
All water infiltration techniques may be initiated from surface or sub-surface mother craft, dropped by parachute from fixed wing aircraft, or delivered by rotary wing aircraft. Three ODAs per SFG can infiltrate or exfiltrate using closed circuit breathing equipment. Three ODAs per SFG are capable of utilizing open circuit breathing equipment for non-tactical applications (i.e., ship bottom searches and recovery operations). Nine ODAs per SFG are trained to infiltrate/exfiltrate by combat rubber raiding craft (CRRC). Twelve ODAs per SFG can infiltrate/exfiltrate by surface swim techniques. All surface swim operations are limited to sea states not to exceed 3 foot chop and 4 foot swell. Surface swim operations will not be conducted against currents in excess of 1 knot.
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