Mail Box for Purging Carbon Dioxide from Lunar Module
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"Mail Box" for Purging Carbon Dioxide from Lunar Module

May 5, 2003
Interior view of the Apollo 13 Lunar Module (LM) during the trouble-plagued journey back to Earth. This photograph show some of the temporary hose connections and apparatus which were necessary when the three astronauts moved form the Command Module to use the LM as a "lifeboat". Astronaut John L. Swigert Jr., command module pilot, is on the right. On the left, an astronauts holds in his right hand the feed water bag from the Portable Life Support System (PLSS). It is connected to a hose (in center) from the Lunar Topographic (Hyson) camera. in the background is the "mail box", a jerry-rigged arrangement which the Apollo 13 astronauts built to use the Command Module lithium hydroxide canisters to purge carbon dioxide from the Lunar Module. Lithium hydroxide is used to scrub CO2 from the spacecraft's atmosphere. Since there was a limited amount of lithium hydroxide in the LM, this arrangement was rigged up to utilize the canisters from the CM.

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