A support installed at sea in grounded or floating manner, the support including both a processor installation on its deck for processing a first liquid that is dangerous and/or corrosive, preferably liquefied natural gas (LNG), and also at least one tank for storing said first liquid, preferably an LNG tank incorporated within the hull of the support under the deck. The support includes at least one container situated outside the support and situated at least in part, and preferably completely, below the deck of the support on which said installation is supported, the container being fastened to the support, preferably in reversible manner, the deck including or supporting a first transfer mechanism suitable for transferring towards the container any leakage liquid flowing from at least a portion of the installation, in particular in the event of a leak.