In the US, they're known as Sandtigers. Outside the US, they're called Grey Nurse sharks. Check out the video of the capture to remove an entanglement from around the gills of this one. Pretty amazing stuff. These sharks are very laid back, but crazy powerful and very fast. I've been in the water alot with them. One of my favorite sharks. It's nice to see these guys stepping in to save a wild one.
http://shine.yahoo.com/author-blog-posts/watch-amazing-shark-rescue-224400857.html
http://shine.yahoo.com/author-blog-posts/watch-amazing-shark-rescue-224400857.html