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Anyone who has ever dove underwater to the bottom of a pool or taken part in scuba diving can attest to the pressure that water places on the body. Even at shallow depths, you can feel the difference in your lungs, your head, your ears, and more. As Dive Deep Scuba says, the limit for recreational, non-beginner scuba diving is about 130 feet — a sliver of the depth that OceanGate's destroyed Titan submersible descended. Additionally, this is without wearing a special deep-diving suit to keep you alive at the lower depths. Go lower and you'll suffer decompression sickness when returning to the surface (also known as "the bends"), a condition that results in headaches, dizziness, numbness, joint pain, an inability to concentrate, and more. 

Scientific American says that for every 33 feet you go underwater, the pressure on the body increases by 15 pounds per square inch (psi). Sunlight cuts out at 656 feet deep, or 298 psi. Rottweiler bites equal 328 psi, per Ruffle Snuffle. Crocodile bites measure up to 3,700 psi. A great white shark can bite up to 4,000 psi. Where the Titanic rests underwater, pressure pushes in at an incessant 5,500 to 6,000 psi. All of that pressure was pushing on the Titan when it imploded, as well as each of the individuals inside — every single square inch of their bodies all at once. Framed in terms of weight, NBC News calls that "high thousands of tons to 10,000 tons" pressing down.

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