You are in your research submersible, diving deep into Point Nemo, the farthest point in the world from land. At around a mile down, you see a giant dorsal fin. It looks like a shark. You then see its body; a giant shark. It's a megalodon, an 18-meter-long shark that seemingly went extinct, but now lurks in the depths of Point Nemo. It seems hostile. What do you do?