If this is the wrong place to post this, I apologize in advance and welcome a tip to the right location.
A Japanese scuba diver with a passion for underwater photography recently ran across this mysterious underwater formation while diving off one of the small islands of southern Japan.
No one could tell him what caused it. The explanation came recently and it’s a jaw-dropper. Check it out here:
The Deep Sea Mystery Circle - a love story | Spoon & Tamago