Season 9 Episodes21
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Ranked #16 of 21 in Season 9•matches the season avg
Find out whether a sewer drain full of combustible gas, when ignited, will turn an innocent manhole cover into a missile, and whether truck bedliners are truly bite, crash, and bomb proof.
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"Drain Disaster" is episode 18 of MythBusters season 9. It scored 7.0/10 from 133 votes, ranking #16 of 21 episodes this season (season average 7.0). It aired on November 2, 2011.