Haos (escape)

Chapter: C5 · The Underwater Facility: the Ducts, Haos and the Escape
Where: 5-3 Upper Levels: the climb out of the chamber and the circular drainage ring; 5-4 Emergency Escape Route: the tunnels

Weak point

The head and face; in the tunnels, its hand when it smashes through the wall

A huge B.O.W. that hatches in 5-2, at the intersection with Jake and Sherry. At times it's invincible: if it chases you, don't waste ammo, run. In the drainage ring only its upper body shows, and it falls fairly quickly to explosives.

Reward

After the ring: 40mm Acid Rounds and shotgun shells on the floor past the doors.

Title update 1.03 (April 2013) “fixed the difficulty” of the Haos fight in 5-3; the Switch version already includes it. No source publishes its health.

Step by step

Escape: climb the wall after the cutscene and run counter-clockwise holding sprint. Piers goes up first; have him pull Chris up straight away.
When it blocks the way, shoot its head with your strongest weapon (the Grenade Launcher works very well) until it recoils, or it crushes the platform.
Slide under the low obstacle (dash and slide together, then get up at once; judge the distance by the shadow on the floor). On higher difficulties, failing it is game over.
Chris boosts Piers and hangs on (QTE) while Piers stuns it one last time.
Drainage ring: collect the outer-ring crates first (2, 3, 1, 1, 2 and 3 counter-clockwise): beating it forces you out of the room. Keep 30 m or more on the indicator and aim at the head: machine-gun bursts, then rifles; the shotgun is poor at range.
If it raises an arm, roll or slide aside. The hand sweep covers a wide area: roll or slide to the edge of the platform.
Tunnels (5-4): crawl under the door (press action to crawl faster). In each cabin, when the hand smashes through, shoot the hand once or twice (one explosive round is enough) and slide under the shutter. If it catches you or a door closes on you, you die.
At the last blast door, Piers mashes to hold it open while Chris climbs. Before using the partner door, turn around: Serpent Emblem #19 is on the floor to the left.