The two walked into the scarlet corridor.
The scarlet light painted them red.
However, the scarlet light here was much weaker than the condensed scarlet crystal underground; even though the light came from all directions, it caused no discomfort to them.
"Ka..."
At this moment, a mechanical sound came from behind.
The massive door behind them was slowly closing automatically.
This was no big deal for Xu Xin and Xu Ying, as they could teleport out anytime they wished.
In the moment before the door closed, Xu Xin saw the alien invaders gathering outside through the gap.
There were at least nearly twenty of them.
But none of the alien invaders dared to come close, all keeping a distance of at least twenty meters from the door.
"Boom!"
Even when the door was completely closed, not a single alien invader came near.
