Offshore oil and gas installations are independent structures that are vulnerable to disturbances and threats. Like ships, offshore oil and gas installations also have national flags and legal instruments that protect them. Under international law, offshore oil and gas installations are protected by the Rome Protocol for the Suppression of Unlawful Acts against the Safety of Fixed Platforms Situated on the Continental Shelf 1988. It is noted that there have been several incidents of disturbances and threats that have occurred at offshore oil and gas installations around the world. Some events are well recorded and known to the public, while some events are not public consumption. So far, offshore oil and gas installation operators have received legal guarantees for the security of their installations both on the high seas and in the sea territory of a country based on international law, territorial law and the inherent law according to the citizenship of the offshore oil and gas installation. Through this paper, the author aims to explain the potential threats and disturbances at offshore oil and gas installations and concrete examples of events that have occurred. Another aim is to explain how international legal instruments and immigration law protect offshore oil and gas installations from these threats and disturbances. Through normative legal research, this paper describes a series of threats and disturbances and the international and national laws that have emerged to protect them and their application in the field.