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Some informative facts about Lake Þingvallavatn from The National Energy Authority (Icel. pdf).

Some facts about hypothermia:

Cold Injuries Guidelines (pdf)

Severerly Hypothermic Patients.

The Thingvallasund is in 17th place on an international top 100 list of the most interesting swims, see http://www.worldstop100openwaterswims.com/