A lucky diver managed to capture footage of a rare octopus disappearing into the sand in Port Phillip Bay, Victoria, on April ...

SAN DIEGO — Twenty feet beneath the surface at La Jolla Shores, thousands of living sand dollars have created what looks like an underwater treasure field, stretching nearly a quarter-mile across the ...

Have you ever wandered along a beach and marveled at the gorgeous sand sculptures made by local artists? All of that effort, only for them to be destroyed when the tide comes in or the wind picks up.

Something strange is happening underwater, off the coast of Norway—and it’s not just another seafloor oddity. These odd structures, now called sinkites, are turning our understanding of Earth’s layers ...

Just a few miles off New Jersey’s coast is a series of underwater hills on the ocean floor, made of perfect-quality beach sand tens of thousands of years old. Once those hills existed above the ...