So going from the AVP novel, some key points to consider:
1. The Queen Alien and the rest of the Xenomorphs were actually still in the tunnel right before the wrist-nuke explosion was just about to happen and the tunnel is said to be at least 2000 feet.
2. Alpha-Alien (Grid's name in the novel) was the first (and only) Xenomorph to reach out of the end of the tunnel just somewhere behind Scar Predator and Lex outside before the explosion occurred and killed all the other xenomorphs in the tunnel (save for the Queen herself) and even just the tail end or backwash of the plasma explosion was able to blow Alpha-Alien/Grid to bits.
3. The wrist nuke explosion was stated to be strong and hot enough to instantly turn
millions of tons of ice into steam which "
melted even more ice to create more steam" after it vaporized everything in the underground cavern.
4. The ice pack around the mouth of the shaft and the mess hall next to the pit were catapulted into the air and the ground began to cave in on itself after the ice cavern and pyramid were destroyed. Into the spreading crater, more sections of the whaling station, the abandoned base camp, and the mobile drilling rigs all tumbled and got sucked into the deep bowels of Earth.
Basically the impact of the explosion affected the surface so strongly that the the whole camp and the station around the tunnel turned into one giant sinkhole and there were ice earthquakes that still followed Scar and Lex for a little bit as they got away.
5. The splash radius of the wrist nuke explosion stopped just somewhere short of the iron vat near the cliff and the wharf and the docks over the frozen harbor.
Which based on the real-life location of the movie, was around Olav Peak/Olavtoppen:
Though the AVP wiki makes note of the continuity errors and goofs:
https://avp.fandom.com/wiki/Alien_vs._Predator_goofs#Factual_Errors
And the nuclear explosion takes place on Prince Edward island in the novel:
The precise locations of the film's setting are inconsistent here.
6. The whole crater itself was much farther than Lex could see.
7. The Queen Alien actually emerged out of the crater closer to where Scar and Lex were standing on its edges.