I think one of Brazil's public entities does go onto the island enough for some reason I forget, to build trails, or even just walk the same path that a trail is had.
Don't know what to make of this show yet. That arrow rock did look planted, but then again the team did use best practice and leave it in situ. And there's at least one professional academic, the anthropologist/diver. But the various things the divers find seem pretty irrelevant as ships wrecked all over and I imagine travelling ships just tossed out malfunctioning machinery if they were broken, etc. But that one guy with the beard looks like he's made a living at doing this so there might be a purpose to the dives.
On this episode I cannot fathom how idiotic that snake expert was for diving face-first into a very violent surf. Then :gosh: getting tossed by it into sea urchin spines. Yes, some of the other grumbled about that but if I were a) someone on the team or even b) some cameraman or ethicist/lawyer along for the ride, I'd refuse to work with such an idiot anymore. Have never been in the military but chain-of-command on a dangerous expedition should count for something, and anyone just ignoring orders and instead jumping randomly into the ocean would/should be dismissed. If that means his snake expertise (and come on, there's only one snake species there, and he's already explained their habits such as being unusually arboreal to everyone, so not much more value) was crucial, then if no easy replacement the expedition should simply end. They would have trusted the wrong insane, reckless, egoistic snake expert.
I guess if they've done nothing else they at least pulled up some nice silver coins from that one dive, which they inexplicably moved away from. And assuming those were coins; haven't seen any after-cleaning shots of them.
My only hopes left now at sanity are the anthropologist/diver, the ship's captain, and the bearded guy. I'll just from now assume the others are milking it up and playing to the camera. And diving face-first into poisonous spines for no reason. Frankly I hope that guy dies and they go "well, figures, what a *******" and just keep walking up that trail. Okay, I guess I don't hope that because I don't want anyone to die etc. etc.