Mega ebullition of biogenic methane from an abandoned offshore gas well, North Sea.
Evidence for midwater bubble plume intrusion, fallback, and short-circuiting of the plume.
Effective trapping of seabed released methane underneath the thermocline.
First observation of a spiral vortex methane plume and marginal turbulences.
Megaplumes appear less efficient in terms of vertical methane transport than previously thought.