Bloke named Miller ditched into The Gulf of Carpentaria one night and while his fixed ELT was transmitting nowhere due to being inverted in the mud, he and his mate trod water all night after activating his hand held. The first rays of daylight had a Huey overhead and picked them up. I'm sure they had some concerns about big "bities" that swim around up there, but it all turned out well and helped clinch the AOPA deal.