Pressure

"You are expendable. You are not expected to return." Hadal Blacksite is an underwater facility that has been abandoned. People, or prisoners have been given the offer to have their freedom if they can get a crystal and lost data from the underwater facility. However, there's 115 doors that they have to go through in order to get to the crystal.. and this place was used to make underwater entities... and so there will be entities that will try to kill/hurt you. Because you are a prisoner and you took the offer to take the crystal... but you have no clue what entities will be coming to kill you. Luckily, you have diving gear so you can swim through water. Just don't swim too far away from the Facility or the gear will detonate, killing you. The site is called Hadal Blacksite.