You know, I saw a video once of an Aldabra Tortoise swimming just off the beach. I'm sure others have seen it. There's plenty of images.
http://www.arkive.org/aldabra-giant-tortoise/geochelone-gigantea/video-06b.html Here's a similar video. I couldn't find the other one.
http://www.arkive.org/aldabra-giant-tortoise/geochelone-gigantea/video-06b.html Here's a similar video. I couldn't find the other one.