Scientists warn an underwater volcano off Oregon coast is about to explode

The Axial Seamount – located hundreds of miles off the coast of Oregon and nearly 5,000 feet below the Pacific Ocean’s waves – erupted in April 2015, spewing a mile’s worth of lava onto the sea floor.

And now, the Pacific Northwest’s most active underwater volcano is getting ready to erupt again - although no one is exactly sure when or what will happen.