A large submarine volcano is likely erupting deep beneath the Pacific Ocean.

However, scientists don’t know for sure because the Ahyi Seamount is so inaccessible.

Located in the U.S. Commonwealth of the Northern Mariana Islands, the U.S. Geological Survey said Monday that all indications point to the volcano beginning to erupt in mid-October when hydroacoustic sensors at Wake Island began to record signals consistent with such activity.

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In collaboration with researchers in Tahiti, combined analysis of the signals with data from seismic stations in Guam and Japan suggests that the source of the activity is at or near Ahyi Seamount.

Read more: Fox News