The Blockhouse on the Fourth Line

Sigrin smiles, old blockhouse on the fourth line. Good job with the refresher. O gunnar, take it easy. You're not how i start to say this place has been sealed up tight for decades. There's still dust in here, brought in by the teams that change the filters and restock the oxygen once a year. Or just the rego crete slowly degrading, flexing and shifting as swirls come and go or mars quakes occasionally shake the ground. Either way, there's a layer of it, perhaps a millimeter or two. To see the footprints, i can see where sigrin and her team came in via the secondary, smaller