My wife & I both believe in the unexplainable, and since we hail from the PNW, she's even been an active Bigfoot researcher with one of the largest non-commercial organizations in the world, but this show owes me my Kit-Kat bar. The "actors" portraying the so-called experiences of individuals hardly seem believable a great majority of the time. In fact, the only story - or "actor" - that gripped me enough to not laugh at them was the Chupacabra lady.
As an avid & active Bigfoot researcher who knows more about the mysterious creature than you, my wife confirms the "roars" in the Sierra Nevada episode are completely fake. They seem made for shock, not scientific research. Even as an outside observer I couldn't help but laugh at the fact that these "people" (actors) thought that the legendary Sasquatch would - for some UNEXPLAINABLE, absolutely UNKNOWN reason - faceplant the window of this guys' truck despite years of avoiding detection by actual experts. Even if you take this show with a grain of salt, you might have trouble enjoying it.
Save your salt - and your time.