What is This? Quick ID Guide for Mechanics and Engineers

I found a pirate treasure map in a shipwreck 😳 After leaving the United States to go find a dinosaur in Bali, Indonesia (I received a tip via DMs), I finally got a lead from my local contact. He told me that a few hours away there was allegedly a shipwreck off the coast...but, the waters are very dangerous and there are sometimes sharks near the wreck 🦈 I had to hire a very specialized scuba diving crew to take me to the dive site. Even the expert diver that was with me told me he had only don