Apollo 13 CO2 Crisis: The Mailbox Scrubber Fix

When Apollo 13's oxygen tank exploded, three astronauts had to squeeze into a Lunar Module life-support system built for two — and its carbon-dioxide scrubbers began to run out. This simulation models the real gas-buildup physics inside the cramped cabin: CO2 partial pressure climbs from crew respiration via the ideal gas law, the lithium-hydroxide canisters saturate on a fixed absorption budget, and once the crisis escalates you can build the historic square-peg-round-hole "mailbox" adapter that let the crew wire the Command Module's spare canisters into the LM's air loop — the improvised fix that brought the astronauts home alive.