A Pacific sleeper shark photographed at 3,125 feet below the ocean surface. These sharks are still largely a mystery to science, with little known about the species.

Pacific sleeper sharks found in Alaska, Taiwan and Russian waters. The researchers also discovered that fewer Pacific sleeper sharks have been observed in recent decades off Alaska and Taiwan, ...

Pacific sleeper sharks are closely related to Greenland sharks, to the point that they can interbreed, and from what we do know or have theorized about them, have similar characteristics.They can ...

This Pacific sleeper shark was pulled alongside a research boat for catch and release, NOAA Fisheries says. The predators can exceed 23 feet. NOAA Fisheries photo A mysterious shark that may count ...

This Pacific sleeper shark was pulled alongside a research boat for catch and release, NOAA Fisheries says. The predators can exceed 23 feet. NOAA Fisheries photo A mysterious shark that may count ...

Pacific sleeper sharks found in Alaska, Taiwan and Russian waters. The researchers also discovered that fewer Pacific sleeper sharks have been observed in recent decades off Alaska and Taiwan, ...

Pacific sleeper sharks found in Alaska, Taiwan and Russian waters. The researchers also discovered that fewer Pacific sleeper sharks have been observed in recent decades off Alaska and Taiwan, ...

This Pacific sleeper shark was pulled alongside a research boat for catch and release, NOAA Fisheries says. The predators can exceed 23 feet. NOAA Fisheries photo A mysterious shark that may count ...

This Pacific sleeper shark was pulled alongside a research boat for catch and release, NOAA Fisheries says. The predators can exceed 23 feet. NOAA Fisheries photo A mysterious shark that may count ...

This Pacific sleeper shark was pulled alongside a research boat for catch and release, NOAA Fisheries says. The predators can exceed 23 feet. NOAA Fisheries photo A mysterious shark that may count ...