Luke Tipple interviews the stars of the Shark Week show, "Shark Lockdown."

Marine biologist Luke Tipple interviews the stars of the Shark Week show "Great White Serial Killer Extinction." Jimi Partington and Michael Harris investigate the dwindling California sea otter population and the Great White Shark.

Luke interviews the stars of "Great White Serial Killer Extinction."

Marine biologist Luke Tipple interviews the stars of the Shark Week show "Mako Nation." Riley Elliott and Andy Casagrande discuss the mysteries they uncover about the Mako Shark in one of their last strongholds -- New Zealand.

Luke interviews the stars of "Extinct or Alive: Land of the Lost Sharks."

Marine biologist Luke Tipple interviews the stars of the Shark Week show "Lair of the Great White." Dr. Craig O'Connell and Marc Payne want to know why the Great White Sharks are so much more aggressive off the coast of Western Australia.

Luke interviews the stars of the Shark Week show "Lair of the Great White."

Marine biologist Luke Tipple interviews the stars of the Shark Week show "Tiger Shark King." Austin Gallagher and Christine de Silva discuss their mission to understand the assault on a 14-foot tiger shark in the Caribbean.

Luke Tipple interviews the stars of the Shark Week show "Mako Nation."

Dredgers brave the frigid Alaskan waters hoping to strike gold.

A rainy day leads to trouble when Shawn gets hurt in a bar fight.

Sunny weather brings all dredges out to sea, but conflicts quickly arise.

The Kilchers finish Atz Sr.'s legacy rebuild and Eivin suffers a loss.

Pandemic parenting pushes Eve to her breaking point as winter approaches.

Atz Sr. reveals his legacy build after months of backbreaking effort.

The Browns complete the main house before a massive wildfire strikes.