Deep in "The Fork," Russell rappels a 700-foot cliff to follow a heat signature in a new episode of "Expedition X" airing on Wednesday, Feb. 12.

Tonight’s episode of “Expedition Bigfoot” is called “Perilous Descent.” “Expedition Bigfoot,” season six, episode four, airs at 10 p.m. Wednesday, Feb. 12, The storyline for “Perilous Descent” is, “Deep in ‘The Fork,

“Expedition Bigfoot” can be streamed on Philo, DirecTV Stream or Sling, which all carry Discovery Channel.

In Season 5, Episode 12, “Perilous Descent,” “Deep in ‘The Fork,’ Russell rappels a 700-foot cliff to follow a heat signature; Mireya and Biko track signs outside their base camp; Bryce hears new information about strange vocalizations and discovers that someone has visited his command center.”