Fisherman Finds Giant Rusted Chain, Then Locals Warn Him Not To Touch It

Explaining the radar

To Luke’s surprise, he realized the sonar readings had been misleading. Instead of lying across the seabed as expected, the chain plunged into the earth itself, dropping into the mouth of a narrow crevice.

Luke hovered, staring at it. The opening looked almost unnatural, as though the ocean floor had been torn apart. The sight filled him with an unsettled, eerie feeling.