Cruising through hotland, you eventually reach a large featureless building with a door. You are detected by a camera and you hear someone inside.

After half a minute, Alphys steps out of the door. Its obvious she was not expecting visitors today.

H-hiya! I... was not expecting any visitors t-today... I-its a mess inside, but come in...!

She seems to have quite a bit of social anxiety. Upon stepping in you are met with a messy living space incorporated into a laboratory.