Sonoluminescence The emission of light from imploding bubbles in liquids. The Pistol and Mantis Shrimp are capable of doing this as well though the light they produce is different and less intense, plus the mantis shrimp is just badass. I wanted to post this now because of that recent post of the AK-47 underwater where Destin said there may have been some of this going on when the bubbles from the gun collapsed. You can watch that video to learn more about what is going on here, but sonoluminescence is still trying to be understood.