Ocean environmentalist Scott Cassell of the U.S. poses in his homebuilt submersible "The Great White" in Singapore, August 29, 2013. Cassell says his submersible runs entirely on electricity and is homebuilt from mostly recycled materials. The two-man craft can deep dive to the depth of 175m (574 feet) and will be deployed on a marine study trip in the waters of Malaysia. [Photo/Xinhua]