Whatever Became of Harold Holt?

Antipodean weirdness:

Some theories suggest the CIA assassinated Mr Holt before he could pull Australian troops out of Vietnam; or he ran off with a lover; or he committed suicide.

The most popular one was British author Anthony Grey's claim that Mr Holt was actually a Chinese spy who fled in a Chinese submarine.

... Mr Holt was with four friends on Cheviot beach, including secret lover Marjorie Gillespie.

"I watched Harold continuously and the water became turbulent around him very suddenly and seemed to boil and these conditions seemed to swamp him," Ms Gillespie told police, according to the brief of evidence tendered to the court.

Alan Stewart was the other person in the group who decided to go swimming, but only ventured out 10m because he was wary of the conditions.