I Got off onto the Wrong Foot... Again! Part 2

This is the 1st episode of Survivor: Jamaica - Second Chances

Challenges
Reward/Immunity Challenge: Lock, Load and Light Three tribe-members must swim out to a platform and climb up to a high platform. They take a club and jump out over the water, attempting to smash a tile which holds a key. Upon retrieving the key, they return to shore and the next contestant begins the circuit. Once all keys have been retrieved, the remaining tribemates use the keys to unlock a box and complete the final phase of the challenge: a puzzle. First place gets tarps and hammocks. Second place gets tarp or hammocks and third place gets whatever second place doesn't take. Winners: ?