Stand power of Narciso Anasui from JoJo no Kimyou na Bouken Part 6. Manifests as a a muscular humanoid wearing what looks to be a snorkel, decorated with the letter "D".
Possesses the power to phase through objects and people, allowing it to rearrange the inner workings of what it has phased into. Can reinforce an ally with this ability by overlapping their body.
Is also able to leave an imprint of an attack and then release it upon command (such as a kick released from a footprint).
Namesake is the Van Halen album Diver Down.