Scientists with with Advancing Knowledge of Methane in the Arctic (AKMA) discovered an underwater mud volcano in Norwegian waters using ROV Aurora from research vessel Kronprins Haakon:
Found at a depth of ~400m (1300ft), this underwater mud volcano erupted from within another older crater, that supports a vibrant ecosystem including anemones, sponges, corals, sea stars, and tube worms.
Full article at: MentalFloss 11may23