Oceanographic surveyors of the sea floor in the area of the Bermuda Triangle and the North Sea region between continental Europe and Great Britain have discovered significant quantities of methane hydrates and older eruption sites.
Because of the correlations and existing data, the two envisioned what would happen when gigantic methane bubbles explode from natural fissures on the seafloor.
Makes sense to me. There would be no warning, and nothing you could do. You might be able to set up a warning system for aircraft, though, perhaps with satellite monitoring. I don’t think that ships would have the ability to escape. Too slow and unmaneuverable. Better to avoid the area, or perhaps to better map the deposits, and put them on the charts like other hazards.