For the first time ever, scientists were able to film a volcano erupting underwater. Because of the extreme pressure (at 4,000 feet below sea level!) they could get quite close to it. Crazy!
In the 1980s, a gulf oil drilling company was drilling a hole in a lake in Louisiana and just happened to drill into a big salt mine that was underneath. This basically opened a vortex that caused the lake to entirely empty into the mine, sucked in a large area of land around the lake, and make the gulf flow north onto land for two days in a giant 150 ft waterfall (the photo above). That would be a thing to see.