These Groundbreaking Photos Show Two Worlds in One

 A thin layer of molecules separates two worlds on our planet: the undersea and what lies above. Photographer David Doubilet unites these disparate universes in his captivating "over-under" images. 

Father and son fishermen in a wooden outrigger glide over a shallow coral reef in the lee of a small islet in Kimbe Bay, Papua New Guinea. Kimbe Bay is a deep basin punctuated by coral-topped seamounts and healthy fringing reefs within the Coral Triangle, an area of the Pacific known for high marine biodiversity. 

A group of chinstrap and gentoo penguins rest on a small ice floe called a "bergy bit" near Danco Island, Antarctica. The penguins were cautious and wary as the photographer circled their frozen island with a snorkel. 

Descendants of the legendary Satawal Island navigators play in the warm waters of the Caroline Islands in the Federated States of Micronesia. 

An American crocodile patrols a mangrove channel in Gardens of the Queen National Park, Cuba. Gardens of the Queen marine sanctuary is a thriving archipelago of islets, coral reefs, and mangroves that supports healthy populations of apex predators. 

Reference: National Geographic