A ship will sink when it is heavier than the water below it. Air bubbles replace the water, which reduces the overall water density.
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A ship will sink when it is heavier than the water below it. Air bubbles replace the water, which reduces the overall water density.
But the bubbles aren´t big enough to be a threat. How big can they be if just one pipeline is their origin, even if the gas expands? Will you rip open the pipeline over several dozen meters? They also get diluted once they rise up.
The methane bubble area in the image has a diameter of 200 meters. That's enough for an entire aircraft carrier. Expansion is not necessary, the turbine(s) just have to be strong enough to keep pushing air into the pipeline.
You do that with a valve every 100 meters or so. I should have mentioned that in the text. :-)
That's ok. It just has to be enough to replace ~20% of the water below the ship. Then it sinks.