A group of people watch a science experiment at a military base with C02-3 Printed on multiple walls.
A bunch of people gather with CO2-3 written on the walls.
Group of people doing some testing of water and some storage cabinets with CO2-3 on them.
Several people stand in a room with lockers that read CO2-3
A group of people watch a woman at a table the walls in the room say co2-3.