Munter, who says when her racing career is over she'll be a scuba diving instructor, e-mailed CNN.com saying it was important for her to fly halfway around the world to get out the message of the film.

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He is a qualified diving, climbing and windsurfing instructor and also lists skiing, mountaineering and motorcycling among his interests.

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The 69-year-old was chief instructor of the joint services diving school before he retired from the service in 2000.

BBC: Diver John Smith

When he was appointed chief instructor for the tri-services diving school, he adopted BSAC's method of teaching.

BBC: Diver John Smith

"They've left the mirrors inside the bathrooms, so you can actually take a look at yourself while diving, " says Jason Shaddox, an instructor with local dive company Don Foster's.

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Since his retirement Mr Smith, who became an MBE for his contribution to diving, has worked for the Diving Diseases Research Centre in Plymouth and is still a part-time instructor for the Combined Cadet Forces dive team.

BBC: Diver John Smith