Boom (navigational barrier)
Navigational barrier / From Wikipedia, the free encyclopedia
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For other uses, see Boom.
A boom or a chain (also boom defence, harbour chain, river chain, chain boom, boom chain or variants) is an obstacle strung across a navigable stretch of water to control or block navigation.
In modern times they usually have civil uses, such as to prevent access to a dangerous river channel. But, especially historically, they have been used militarily, with the goal of denying access to an enemy's ships: a modern example is the anti-submarine net.
Booms have also been used to force passing vessels to pay a toll.[1][2]