This strikes us as a good idea for a good cause. Divers in Ireland are going to attempt a dive in October of 2012 of over 12 hours to reclaim the Guinness World Record for "Longest Open Saltwater SCUBA Dive (cold water)". The team set the record in October of 2009 with a time of 11 hours and 42 minutes. The record was broken by a Maltese team in February.
The team will be raising money for the Royal National Lifeboat Institution and Hand in Hand a children's cancer charity in Ireland.
You can see details on the World's Longest Scuba Dive website.
The website has a link to iDonate.ie where you can show your support.