In Stalker 2: Heart of Chornobyl, players exploring The Zone will encounter various NPCs, triggering quests ranging from minor tasks to substantial side missions like "For Science!" This mission begins with Skif meeting Yaryk Mongoose, who needs help activating a second measuring device atop a silo. While short, it rewards players with a Malachite pass, granting access to the STC Malachite facility.

1. Initiating "For Science!"

To begin, find Yaryk Mongoose in the Central Elevator area of the Chemical Plant. Approaching this location will trigger a radio call between Mongoose and Skif. Head left past the conveyor belts, ascend the rusted stairs, vault the railing, and speak with Mongoose on the first floor. He'll explain the need to activate a second device on a nearby silo, initiating the quest.

2. Reaching the Silo's Summit

Exit the room and climb to the building's roof. Dispatch any rodents encountered. A room with broken windows offers access to an external walkway and ladder leading to the silos. Equip your bolt-action weapon to counter electro anomalies. Proceed left along the silo's top to activate the device. Activating the device will attract a group of Bloodsuckers.

3. The Bloodsucker Encounter & Confrontation

Eliminate or evade the Bloodsuckers and return to Mongoose. He'll explain the experiment's unintended consequences. Players can choose to kill Mongoose for endangering Skif or accept the reward peacefully. Both options yield the Malachite pass; however, choosing the peaceful resolution also provides additional coupons. The pass allows entry to the STC Malachite base, unless already accessible via the main storyline.