Situation: A planet similar in size to the Earth has a Eurasia+ sized continent at its South Pole. It is hit by a huge asteroid near its South Pole. This would produce a very large crater/basin. Things would be very bad for a long time, but after a long while equilibrium of sorts would be reached. Assuming that the basin was completely landlocked, I assume that snow and ice would slowly start to collect in it and be unable to escape.
Could such an impact basin be large and deep enough to absorb all of a planets oceans as precipitated ice and snow and leave the rest of the world a desiccated desert?
I assume that this would not be possible with Earth’s oceans as their volume is simply too large, but perhaps a planet with much less water - one tenth-one to one hundredth of Earths water?
If not what would stop it?
Assume no magic and all physical laws are as we would expect.