Although the Republic of Korea (hereunder, Korea) is a member of the UNCLOS, it has enacted and implemented the Territorial Sea Act to clarify the breadth of Korea’s territorial waters and guarantee the right of innocent passage of foreign ships within it. In addition, Korea can exercise its jurisdiction with various legislative regulations related to the passage of foreign vessels through its territorial waters in order to protect its national interest. Under Article 5 (1) of the Territorial Sea Act, foreign vessels are allowed innocent passage through Korea's territorial waters, provided it does not compromise the peace, public order, or security of Korea. However, Article 5 (2) specifies that certain activities such as fishing, research, or surveys conducted by foreign vessels within Korea's territorial waters are considered detrimental to its peace, public order, or security. The Supreme Court has ruled that using a fish detector on a foreign vessel to explore the seabed for sunken ships in Korean territorial waters is deemed as a foreign vessel's passage under Article 5 of the Territorial Act, regardless of whether the specific activity itself harms the peace, public order, or security of Korea.