'Dual Survival' Season 4 promo: Will the partnership end?

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Could the fourth season of "Dual Survival" be the end of the partnership between Cody Lundin and Joseph Teti? That's certainly what a new promo for Season 4 implies.

The above Zap2it-exclusive video teases that tensions are reaching an all-time high between the two survival veterans. Considering the pair will be tossed into hard-to-survive situations like the mangroves of Sri Lanka, the desert in Oman and the mountains of Norway, it's no wonder they're so stressed.

"Dual Survival" returns to Discovery Channel on April 23 at 9 p.m. ET/PT. What do you think of this new promo?
Photo/Video credit: Discovery