https://au.news.yahoo.com/video/watch/37776007/yachties-rescued-off-moreton-island-tell-their-story/
The other night listening to a rescue unfolding on channel 16 of a yacht with a hole in its hull sinking near Henderson Rock Moreton Bay
All crew were rescued, and I am not sure how they did it, or how they managed to get a hole in the bottom of the boat. The reef is 9.5m deep but it does get exposed when the weather is bad and moon was full. I guess, just really bad luck.