Say a small 2 to 3 mile wide asteroid impacted the Pacific ocean near Zealandia. Mostly Iron going around 50,000 mph. Would the impact be great enough to force the submerged continent to rise above sea level? If that wouldn't do it, would any impact increase the mantle pressure enough to force that continent back above the waves? I know it was thinned by stretching and that caused it to fall below the water. Is there even enough rock left to raise it the 300 to 400 ft it would need to be raised?