The world views the moon jellyfish as a problem to the environment. They invade ecosystems, and are a pain to swimmers. American researchers however are saying that they may be the most efficient swimmers on the planet. Scientists are saying that the moon jellyfish has a 2 phase swimming motion. In the first stage the jelly contracts its open bell and pushes water behind it, it would then return to its original shape and fill water again. This finding would be useful to the Navy, using such a low energy- high efficiency thrust.