Secrets Ultrakill - 5-1

Located in the central blue skull room, submerged underwater beneath a stone archway.

To the right, obscured by stalagmites near the first green hookpoint. Secret Mission: 5-S 5-1 secrets ultrakill

For further completionist details, you can refer to comprehensive guides on the ULTRAKILL Wiki or Steam Community. Located in the central blue skull room, submerged

Proceed to the exit tunnel near the fifth Soul Orb. Locate a breakable vent in the wall that leads to the secret exit portal. 5-1 secrets ultrakill