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A narco-submarine is a type of custom ocean-going self-propelled submersible vessel built for smugglers.
Newer submarines are 'nearly-fully' submersible to be difficult to detect visually, by radar, sonar, or infrared systems. Cargos are typically several tons. In 2015, the largest-known cargo of 7.7 tonnes was seized on a semi-submersible.
The capabilities of these craft are increasing ; their operating places and circles are widening; and their numbers are growing.
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