Hertfordshire hero Andy Nation has set off on his 147 mile swim from Teddington Lock to Calais on after being forced to postpone the swim when he suffered a fall and broke his neck in June 2012.
Despite having had a bone transplant from his hip and a metal plate screwed to his spine last year following his accident, Andy has made a remarkable recovery.
The swim, which has never been done before, follows on from Andy's World record swim of the entire length of the non-tidal River Thames in 2005.
The ambitious long distance swimmer has vowed to raise thousands of pounds for Herts Air Ambulance and the Hertfordshire MS Therapy Centre, and has set his target at £1 million.
Dawn Easby, Herts Air Ambulance Fundraising Manager, said: "Despite a major, life threatening setback last year, Andy has continued to train for this huge challenge. We're really looking forward to cheering him off on the launch day and reporting on his progress as the epic swim continues.
"It's so humbling when someone does something so seemingly impossible, whilst steadfastly championing your cause. Herts Air Ambulance receives no direct funding from the Government or National Lottery, so support from people like Andy is essential."
You can follow Andy's Teddington to Calais challange here