When they crossed the area and the blast happened, the beasts didn't follow them.
The blast caused the water to rain down on them and the four of them entered the next sea zone as it rained all over.
The entrance of the area is once again shrouded by the mist but this time it only lasted for a few seconds, when their vision returned, there is a region of the sea which has some rocky islands right in front of their eyes.
The islands are very small and they couldn't be considered a full-scale island, they are some extremely large rocky surface in the middle of the ocean.
Sam looked through the hologram and after confirming that nothing is there in the vicinities, he immediately landed the car on one of the rocks and came out of it.