Atomic Heart features many puzzles as players make their way through Facility 3826. Players control Comrade Major P-3 as he fights to stop rampaging robots in an alternate universe Soviet Russia. The early portions of the game take place in the underground Vavilov Complex. Players must activate the Birchtree to escape this complex. While finding canisters to plug into the tree, players will discover a strange experiment involving animals in tanks. P-3 must complete this experiment to gain access to the Pesticide Workshop and acquire the Pesticide canister. Follow this guide to complete the experiment by activating the correct tanks in Atomic Heart.