Young Synovial Sarcoma Survivor Wishes to Swim with Dolphins

Mike Hudak custom-made a prosthesis to help 12 year old Tyler swim with dolphins:

http://www.tcpalm.com/news/2011/jun/27/donated-prosthetic-lets-young-sebastian-cancer/

I am not sure why he needs a prosthesis to swim but I'd be curious to see what it looks like...