In the depths of the Pacific Ocean, 470 kilometers off the Oregon coast, a drama is unfolding. Axial Seamount, one of the most active underwater volcanoes in the world, is swelling with magma.

"Did you know that this is actually a volcano?" NBC 7 meteorologist Francella Perez asked Channin Franz, a hiker at Carlsbad's Calavera Nature Preserve. "The only way I knew this was actually a ...