Lost is the fifth chapter of The Callisto Protocol's main story. Read on for a detailed walkthrough, list of rewards, tips for completion, Lost Data Bios Locations, as well as other strategies!

Lost Walkthrough

Lost Summary

Lost Objectives
Find Elias. Find Shelter in the Outpost. Keep Moving to the Hangar. Try to help the Trapped Worker. Find a way through the Tunnels. Enter the Tunnels to the Garage. Reach the Control Room. Find the Keycode. Unlock the Security Gate. Explore the Power Station. Enter the Power Control Room. Find Dani in the Courtyard Follow Dani. Find Dani.

Lost Detailed Walkthrough

	Objectives
1	Find Elias. Once the cutscene is finished and you have control of Jacob again, walk through the storm to find Elias. Keep heading in the direction of the light posts until you hear from Elias. He'll send out a distress signal which will give off a faint blinking red light to let you know his position. Once you reach him, you'll see he only has a few moments left. Dani will arrive on a Snowcat, take out Elias' implant and point you in the direction of the Hangar.
2	Find Shelter in the Outpost. Use the console to open the gate. Head towards C2 Surface Exploration. There's a Reforge Station just past the main entrance. Take the time to resupply before going further. Head deeper into the building and keep on following the yellow light posts. This will take you out of the building and one step closer to the hangar.
3	Keep moving to the hangar. Some enemies will try and ambush you, it is recommended to heal up if you can. Follow the trail leading up to the hangar, and this will lead to a dilapidated bridge. Make your way across the bridge, and open the gate at the end. This will take you to a courtyard that leads to the tunnels.
4	Try to help the trapped worker. The keyword here is “try.” Once the worker tells you to find something to pry the door open with, enemies will start spawning in the area. No matter how fast you deal with the enemies, the worker's fate is the same. After all the enemies have been dealt with, look for a door that is giving off a faint yellow light. When you approach this door, the enemy will break down the door. The implant bios of one Richard Cids, you will need this to get to the Tunnels. Find the other door that gives off a faint yellow light and go down the Tunnels.
5	Find a way through the Tunnels. Head down the stairs and follow the yellow light. Go right from the wall that says A1 Access Bridge, then left into the corridor, then right at the wall that says “Follow”, and then crawl through the small space in the debris. When you crawl out, go in the direction of the white light post, then make a left once you're near the light. Continue down that corridor and it will lead to a slightly more open area. If you go left, there will be some supplies including an Implant Bios in that room, once you retrieve these items, look for signs in the wall that says “Follow”.
6	Keep following the yellow light. Squeeze through the gap in the wall and into another area. You will encounter mutated crawling enemies that explode when they get near you. Shoot these enemies before they get near you. Head in the direction where the crawling enemy emerged from and the take the stairs going down on your right. An enemy will jumpscare you, be prepared to block. Use your GRP to hurl them at the spikes in the wall. Climb up the stairs and take the path to the right. Continue on the same path until you reach the stairs, go down then turn left at the sign. Keep on moving forward, going down the catwalk and squeezing through gaps in the walls, until you reach the enemy by the stairs. Once the enemy is dead, head on up the stairs and keep following the light until it leads you to the ladder going back up the surface.
7	Get to Dani. Once you're back on the surface, head over to Garage Airlock N107, Dani will be inside fighting off enemies in a room. Deal with the enemies on the ground floor and then use the Shiv to open the jammed door. Take the Riot Gun and head towards Gate Control N205. The console will require a keycode. Look around for the body of one Lt. Devon Wayne to access the console, then head to Workshop N212 and exit at Motorpool Airlock N108. ►Riot Gun Upgrades and How to Get
8	Get to the Power Station. Enter through Powerstation Airlock S105 and activate Powerstation Lift S107. An enemy will be inside the lift when the doors open so be ready. Crawl through the small space through Prisoner Transfer S408. You need to get Gate S450 open. Go left and head towards Security Control S411. This room will require a Gate Fuse. Head down the steps and vault over the blue crate to retrieve the Gate Fuse. Return to the control room and open Gate S450 to get to the power station main room.
9	Survive the incoming attack. Interact with the dead guard that is caught in the gears. Once you extract the implant bios, this will trigger the power station to power up. Numerous enemies will start popping up, so use your surroundings to your advantage. You can hurl enemies towards the gears or the industrial fan to save on bullets. Once the enemies are down, head into the power control room and use the keycode to open the gate.
10	Meet with Dani in the Courtyard. Go to Courtyard Access S502 by the Reforge Station, and exit through Courtyard Airlock S106. Make your way through the courtyard and prepare to get ambushed as some of the corpses will reanimate and attack you. Once onboard the Snowcat, let the cutscene play as you head towards the crash site of your ship. Once your regain control, follow Dani inside. You'll find Dani inside the Cargo Hold. After another cutscene, follow Dani up to the Hangar Control Room.
11	Get to the Hangar Follow Dani inside to the Control Room. Head up to stairs to the airlock. Once you exit, Dani will interact with the console to open the next door leading to the elevator. While Dani tries to bypass the elevator controls, take a look around the area to resupply. When you're ready, get on the elevator with Dani and let the cutscene play out until you regain control of Jacob.
12	Avoid falling debris! Avoid any of the debris as you're falling down because even the slight graze will lead to your immediate death. Once you manage to grab onto something, the screen will turn black, a hallucinogenic cutscene will play out triggering the next chapter.

Lost Obtainable Weapons

Riot Gun

Riot Gun
A two-handed shotgun designed for riot suppression. Developed by Jann and Lobell and based on the UJC Modular Weapons Platform.
Type	Primary
Acquisition Type	Story Progression
Base Ammo Capacity	4

The Riot is the only other shotgun in the game. This pump action shot gun is useful against tankier enemies and even mutated biophages. Get this from Dani when you meet up with her in the Garage.
Riot Gun Upgrades and How to Get

Lost Enemies Encountered

Frozen Biophages

Most of them are dead, but there are some that are still alive and will attack you when you are close. Like regular Biophages, they are easily dealt with using the Stun Baton. Remember to shoot the tentacles if they appear.

How to Beat Biophage

Rushers

Rushers are quick and agile. It is recommended to weaken them with ranged weapons before engaging in melee combat.

Bloated Biophages

Bloated biophages can take a beating with its large health pool. Use the GRP to throw them into spikes if there are any.

Bloodworms

Bloodworms are easily dealt with using melee and guns. They make a distinct sound so it is fairly easy to spot them.

Spitters

Shoot its head with the hand cannon to neutralize its ranged attacks, then eliminated it with melee attacks. Take note you can also block its ranged attacks.

Lost Tips and Strategies

Follow the Lights

If you have trouble seeing through the storm, increase your brightness and lower the particle effect. This will require you to begin again from a checkpoint, but it will help you navigate through the storm.

Best Settings Guide

Pay Attention to the Walls

While inside the tunnels, pay attention to the writing on the walls as they will point out “This Way” and “Follow”. If the path diverges, it will also show cross marks to indicate that that path is a dead end.

Lost Data Bios Locations

Miranda Kristofich: Terraforming (Audio Log)

1	After opening the gate at the start of the chapter, go straight past the door marked C2 Surface Exploration to reach a set of buildings. Enter the building on the left.
2	Once inside, check the shelf on the left side of the building to find this Audio Log.

Richard Cids (Implant Bio)

1	Progress through the chapter until you need to help a trapped worker. Survive the incoming horde of enemies, then head to the door with orange lights above it.
2	Defeat the monster as it breaks down the door, then enter the room and interact with the corpse on the ground to get this Implant Bio.

Dr. Caitlyn Mahler: Combustors (Audio Log)

1	Progress through the tunnels until you reach the first intersection lit by an orange overhead light. Head through the room on the left.
2	Once inside, you can find the Audio Log on top of a small table.

Lt. Devon Wayne: Close the Gate (Implant Bio)

1	After receiving the TK4 Riot Shotgun from Dani Nakamura, head straight up the stairs and into the next room.
2	Once inside, interact with the corpse on the ground at the far end of the room to get this Implant Bio.

Ofc. Aaron Taycho (Implant Bio)

1	Progress through the chapter until you reach the large doorway to Prisoner Transfer S408.
2	Once inside, head to the corpse stuck inside the machine at the far end of the ground floor to get this Implant Bio. Note that extracting this Implant Bio will trigger a horde of enemies.

Max Barrow: Max’s Concern (Audio Log)

1	After returning to your crashed ship, head inside and go through the second doorway on your left.
2	Once inside, you can find the Audio Log on top of the desk on the right side of the room.

Sgt. Scott Dvitny: Eradication (Implant Bio)

1	After the cutscene at the crashed ship, follow Dani through a set of narrow metal doors. You will find a vehicle at the right side of the room.
2	Check the back of the vehicle and interact with the corpse there to get this Implant Bio.

Dr. Caitlyn Mahler: Shipments (Audio Log)

1	Progress through the chapter until you reach the elevator room with dying Security Unit robots.
2	Once inside, you can find this Audio Log at the right side of the room on top of some crates.

All Implant Bio Locations

The Callisto Protocol Related Guides

Complete Story Walkthrough

List of Chapters

Chapter	Summary
Cargo (Chapter 1)	Jacob and Max are flying from Europa to Callisto on a standard supply run when they learn that they have been boarded by the Outer Way terrorist organization.
Outbreak (Chapter 2)	Jacob finds himself a prisoner of Black Iron Prison. When he wakes up, Black Iron is in complete chaos. Now he has to find a way out of this hellhole.
Aftermath (Chapter 3)	Jacob must help Elias free the one prisoner that can get them out Callisto. Jacob must venture deeper into the facility to access SHU, the maximum-security unit where that prisoner is held captive.
Habitat (Chapter 4)	Jacob has to rendezvous with Elias at the Tram Station in the Habitat Dome. These creatures have begun mutating, evolving into stronger enemies.
Lost (Chapter 5)	Jacob is out of Black Iron Prison, but now he finds himself in the barren wastelands of Callisto. Dani has a plan to get to the hangar, but everything doesn't always go according to plan.
Below (Chapter 6)	Jacob wakes up underneath all the rubble of the fallen hangar and learns the existence of Arcas, the first colony. Now he has to bring power back to the station to use the transport platform to Arcas.
Colony (Chapter 7)	Jacob arrives at the Arcas colony and learns of the truth behind the Callisto Outbreak. Now he must race back to the warden's tower or face the consequences.
Tower (Chapter 8)	Jacob finds himself a prisoner of Black Iron Prison yet again. Only one thing remains: he has to race against time to save Dani and get off Callisto.