An interesting read in the link below of the discovery of a NarcoSub discovered.
http://www.nydailynews.com/news/world/2011/02/15/2011-02-15_colombian_military_seizes_fullysubmersible_100foot_drug_sub_capable_of_holding_8.html (http://www.nydailynews.com/news/world/2011/02/15/2011-02-15_colombian_military_seizes_fullysubmersible_100foot_drug_sub_capable_of_holding_8.html)