...recording initiated.

this is researcher jery. log entry two. site 7 underground wing.

they introduced a fourth subject. S4. they didn't tell us where it came from. just wheeled it in on a sealed transport cart and dropped it in chamber four as if it was a part of routine. it's smaller than the others. almost fragile looking. but something about it feels off. the air in the wing changed the moment it arrived. heavier. like static before a storm.

the strange part is how the other subjects reacted. S1 stopped tapping. completely still for the first time in days. S2 wiped its drawings off the glass. S3 finally moved. turned its back to the observation window. facing S4's chamber instead.

dr. jinx says this is normal territorial behavior. says we're making progress. i asked him what the goal of phase two actually was. he smiled and said i'd find out soon enough. i don't like the way he said it.

i tried to access S4's intake file. classified. level six clearance. i'm level four.

the fluorescent lights flickered twice during lunch. maintenance says the electrical grid is fine.

i'm not so sure anymore.

tomorrow they're running the first interaction test between S4 and the others. i don't know what to expect.

[LOG.END//01.18.26//S7UW//JERY//LVL4]