Taks question

How about a sudden release of pressure..

There is compressed gas at the top of the container above the liquid. This is rapidly discharged -- in less than a second (POP! ).

Then there is a flood of gas as the now unpressurized liquid releases the dissolved CO2 it has held in solution. That's the mess.

Finally, dissolved carbonic acid (H2CO3) reverts back to CO2 and water and the newly generated bubbles are released over a period, especially as the liquid warms and lowers CO2's solubility. This is the attractive bubbling that makes a sparkling beverage a happy occasion.