I first read about those tunnels a while back, they’re ancient lava tubes, and it was suggested that it would be relatively easy to seal the tubes and a reasonable climate created inside.
There’s water on the moon, and I’m sure I read that oxygen and other gasses necessary for human survival can be extracted from lunar rock. And let’s face it, there’s no shortage of solar energy available up there.
Recent orbiter observations have given exact dimensions of the tube, which would easily accommodate a fairly large colony.
A glass dome over that hole would make an enormous skylight!