I knewa kayaker who was also a photographer. He was on an expedition with his group and went ahead to film them from a spot. This spot was on a large rock overlooking the rapids. Well after the group passed and he was leaving he got bit by eastern diamond back. Lucky the bite was on his ankle bone but enough poisen got in to cause serious problems. He caught u with his group after a ardous trip to doctor found out that anti venom would be of no use. Good news he survived.