The invention proposes a marine security system, which comprises at least two different monitoring elements (IRC, IRS) and a controller (PC) connected thereto in particular for warding off pirates, said controller triggering an alarm and/or activating alarm devices as a function of the displays of the different monitoring elements. In addition, at least two separate line systems (LA, LB) and outlets (DA, DB) connected thereto are provided, from which at least one substance can be discharged. In the event of an alarm, at least one substance is specifically supplied to the outlets (DA, DB), wherein said outlets are installed in different locations or sections (A1-A5, B1-B5) of the hull (S) and can be specifically activated there. The outlets (DA, DB) may also have different designs in order to optimally discharge the respective substance, for example by atomizing, nebulizing, spraying or pouring.