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"Y'know in hindsight, I can kinda see why his tenancy was cut short.."
You enter the basement only to find it in worse condition than any other room in the house. It MAY have something to do with the enormous poorly clogged-up crater in the floor, but that's like, pure speculation. It may also have something to do with the faint traces of ambiguously red stains lining the wall, and the abrupt 'H E L P' scrawled alongside them.
"Did he confuse the wall for the phone..?"
Assuming Mr. 'W' was feeling delusional, it's not entirely out of the question.. Hopefully he's left some incriminating evidence for you to fish out.
A) Take a closer look at the remnants of the hole. What's that shoddy handiwork?
B) Hm? A turtle shell? Examine it.
C) Inspect the dark gray puddle in the corner.