What would Sam do? What would Sam do?
Dean wasn't exactly the brightest, but he knew some things! Octopus had eight legs, alright, good start. Jelly fish had stingers, but the tops wont sting, (Thank you finding nemo!) Piranhas hunt in packs, and track blood. Sharks, peaceful right? Unless they feel threatened or smell blood. Sammie used to say that swimmers attracted sharks when they flopped around a lot. Probably shouldn't do that then.
The Jelly fish were still out of sight, something about that didn't sit quite right with Dean before one of these things decided he looked threatening. Dean wanted the sharks and Piranhas out of the way first, so he slowly drifted toward the sharks, taking deep shaky breaths as one of them swam close, dangerously close. With the little knife, he cut a gash in the Shark's side, alerting the blood trailers. Before long, a small battle had begun between the sharks and the school of piranha. So far so good.
Next thing to take care of was the octopus. Dean figured if he opened the chest he could throw it at the beast and ultimately distract it. God he felt like a genius after the sharks and piranhas. Upon reaching the chest, Dean found it locked. Of course, because an unlocked chest underwater surrounded by dangerous creatures just wasn't enough for Gabriel. Helplessly, Dean started looking for the key. It just had to be hanging right above the octopus cave didn't it? Way to go Gabriel.
Seaweed. Dean plucked a few strands from their plastic holder and dragged them along as he attacked the cave from the side. He crawled along its sides, reaching the top. The key hung on a hook from a small notch in the rock and dangled directly in front of the octopus. If Dean tried to just take it, he'd be noticed, so a distraction was in order. Tying the strands into a long string, Dean pushed the fake plant out, pumping it to make sure it gave the appearance of something swimming. The stupid thing took the bait. Dean grabbed the key and patiently waited for the creature to crawl back to its little cave.
Time to go open that chest. Dean didn't want to push his luck, but for some reason, this seemed to easy. Well, for Gabriel in any case. He slid the key into it's slot and wrenched the lid open. Before he had time to react, the jellyfish popped from it's box, itching to sting. The little pest stuck itself to Dean's arm, shooting searing pain from elbow to shoulder. Dean wanted to scream, but the water wouldn't let him. He clawed at it's top, digging his nails into its jell-like skeleton and ripping it free. For good measure, he tore the thing in half. Instead of the chest, Dean merely sent the jellyfish in the direction of the octopus, rather happy when it was ripped to shreds.
At the bottom of the chest was a bag, velvet to the touch and navy blue to the eye. Dean snatched it from it's resting spot, and bolted for the surface.