In this exclusive clip from Discovery Channel’s new season of Man, Woman, Wild, former Special Forces survival expert Mykel Hawke explains the physiology behind seasickness.

This is the first of half a dozen exclusive clips we’ll run every Thursday, previewing each new episode of the hit TV show.

In the show, Hawke and his journalist wife Ruth England set off for one of the planet’s most dangerous places and test what it takes to survive. In the second season they’ll fight their way through a flooded Amazon jungle, make fresh water from raisins while lost at sea, navigate through a raging forest fire, trap wild boar and tangle with black bears and grizzlies.

In the first episode, which airs Friday at 9 p.m., the couple tackles the Bermuda Triangle. The scenario: 20 miles off shore of the Bahamas their rented boat breaks down and they must survive days until help arrives.

Check every Thursday for more Man, Woman, Wild survival tips. And make sure to jot down your thoughts in the comments section. In a few weeks they’ll answer reader questions.