Bizarrely, that could be immensely dangerous. There have been a few lakes with large quantities of dissolved co2 that have critically released that gas when jostled, either by vibration or temperature shock (of a couple degrees leading to mixing). There's no telling if it would happen in the ocean, but if currents are slow, a cascade of gas rushing to the surface could be pretty bad.
[0] https://en.m.wikipedia.org/wiki/Lake_nyos