I don't expect all of them to see the closing credits. Okay, I am done. No more ranting - for now. As implied, the group of treasure hunters is killed off by the island's denizens with much prejudice. Since this is still early in the film, almost every fatality is caused by a claw quickly descending on the camera.
Fish men appear to be very strong and able to rip a man's head off with little effort.
They also scratch a couple of people to death in the film's course. Seeing someone's camera point of view attacked by the claw, then watching them fall backwards with little more than superficial wounds to the face, leaves you with wonderment at the frailty of life. Next group to discover the island is a lifeboat full of felons and Claude. Food and potable water become the castaways' priorities. Neither is available, so they drink brackish marsh water and hunt among the reeds.