Six degrees, two minutes, and no diving in
How to enter
Walk in slowly, breathe out as you go, and do not dive or jump. The gasp reflex is what drowns people, not the cold.
How long
Two minutes is plenty and is what most people do. Afterwards you will be colder for twenty minutes than you were in the water.
Who should not
Anybody with a heart condition, and anybody who has been drinking. Both are genuinely dangerous rather than cautious advice.
