Several teams of scientists trying to measure how much methane is actually being released have reported seeing vast bubbles coming up through the water - although analysing how much this matters is complicated by the absence of similar measurements from previous decades.

BBC: Climate 'tech fixes' urged for Arctic methane

Cold ocean water leaks through the rock, hits the red-hot underground lava and bubbles up to the surface.

CNN: ASIANOW - TIME Asia | Travel Watch | Detour

The Chicago team set about creating theirs with a series of different shaped 3D-printed hydrofoils, coated in bubbles, suspended in water.

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