(CNN) – Scientists have discovered an underwater volcano-like feature during Coast Guard-assisted operations off of Alaska.

Scientists can’t know precisely when a volcano is about to erupt, but they can sometimes pick up telltale warning signs.

On the slopes of a volcano in central Mexico, biologist Cuauhtémoc Sáenz-Romero and his team envision a climate refuge for oyamel fir trees and the monarch butterflies that depend on them.