This is a homemade SCUBA tank that is made out of a plastic bottle, some tubing, and hot glue. It works well underwater, and can hold at least enough air for 2-4 breaths underwater. You do need something to keep it underwater, however, so a diving brick or other weight is recommended. Be very carefu...By: cessnao3
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Source: http://www.instructables.com/id/Homemade-SCUBA-Tank/
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