The yachter tells the story of being woken to his heroic cat head-butting him to alert him, and then doing the normal course check to find the whole boat flooded.
View video and read more here about the owner reuniting with his cat who raised the alarm and likely helped save them both:
http://www.abc.net.au/news/2015-09-15/cat-called-major-tom-raised-alarm-on-sinking-yacht-skipper-says/6778672