From OpenwaterpediaSub-3 x 2 Marathon Club)
Sub-3 x 2 Marathon Club
Sub-32 Marathon Club is a select group of people who have swum a full 10 km marathon swim without a wetsuit, fins or paddles under 3 hours and who have also run a full 42 km marathon run under 3 hours.
The 10km marathon swim can be done in fresh or salt water, but must be correctly measured by GPS and not done downstream in a flowing river. The swim can be done solo or as part of a race. The marathon run can be done in any marathon running event or a solo run documented with GPS.