As an important combat platform in modern naval warfare, submarines not only exert unique combat effects, but also constantly face dangerous operating environments. Due to the difficulty of submarine rescue, related courses have always been a focus of naval exercises in countries with submarines. Recently, several NATO countries' navies held large-scale submarine rescue exercises, conducting practical exercises on their submarine rescue systems such as rescue boats, to enhance their ability to ensure submarine safety. Most countries with navies in the world are equipped with submarines, but only a few have the ability to assist in submarine rescue and deep-sea salvage. Due to the wide range of underwater activities of submarines, in the event of an accident, rescue boats must quickly go to rescue. Therefore, the design of rescue boats for submarines places great emphasis on maneuverability and range indicators, with their speed and range designed according to the range of domestic submarines, and with significant flexibility. The submarine rescue ship "Alemdar" from Türkiye, which participated in the NATO submarine rescue drill, has a maximum speed of 18 knots and a range of 8300 kilometers at 14 knots, which is enough to cover the waters of the submarine activities of the country's navy. Generally speaking, submarine rescue involves not only providing life support, underwater transportation, and medical treatment for crew members on a damaged submarine, but also search and salvage, damage repair, and towing operations for the submarine. Therefore, rescue boats must support the efficient operation of relevant rescue equipment. At the same time, due to the different models of rescue equipment on rescue boats in various countries, in joint rescue situations, rescue boats need to have high equipment compatibility and be able to carry out joint rescue operations with other similar vessels. For this reason, many rescue boats focus on redundancy and interactive design. For example, the new submarine rescue ship of the Spanish Navy not only adopts a large tonnage double-layer deck design, but also is equipped with dual side scan sonar, hyperbaric oxygen chamber, underwater communication system, and emergency supply system. In emergency situations, the ship can be deployed within 72 hours. Although the rescue operation for submarines is urgent and arduous, the rescue of submarine accidents is a rare event. Therefore, in addition to strong rescue capabilities, rescue boats also have the ability to perform diverse tasks such as towing, patrolling, transporting, and surveying exploration. For example, the French Loire class rescue boats can also be used to transport divers, carry supplies such as weapons and ammunition, and tow underwater cables. The Brazilian Navy's submarine rescue ship "Giyobel" is also capable of carrying out various tasks such as ocean surveys, cable laying, and engineering maintenance. The comprehensive upgrade of rescue equipment for submarine rescue boats requires rapid rescue and damage treatment of crashed submarines and crew members in turbulent ocean currents, high winds and waves, and complex and changing sea areas. Its rescue equipment includes precise positioning devices, underwater communication systems, deep diving rescue boats, and hyperbaric oxygen chambers. At present, most rescue boats are equipped with the above-mentioned rescue equipment. With the support of these rescue equipment, the diving depth and crew transfer capability of the deep-sea rescue boat are guaranteed. Generally speaking, submarine rescue operations are divided into three steps. Firstly, install, connect, and debug various types of equipment. After confirming the location of the damaged submarine, rescue personnel installed deployment and recovery devices on the rescue boat. This device is the foundation of the entire rescue system and can operate under level 6 sea conditions (wave height of 5 meters). Next is the docking of the rescue vehicle with the crashed submarine. At present, the deep-sea rescue boats in the NATO submarine rescue system can dive more than 600 meters underwater and dock with the distressed submarine. Its underwater operation time is close to 100 hours, and it can carry up to 15 crew members back to the surface at a time. Finally, transport personnel using a hyperbaric oxygen chamber. At present, NATO's pressurized transport system for submarine rescue has autonomous operation and rapid air delivery capabilities, capable of working in temperatures ranging from minus 30 to 60 degrees Celsius, while providing decompression and medical assistance services for up to 72 personnel. Compared to the old-fashioned pressurized crew operated rescue system, this new lightweight hyperbaric oxygen chamber adopts a foldable cabin body and modular support system, which can be quickly delivered by air transportation. In addition, other technologies such as new fully electric propulsion pods and high-precision underwater dynamic positioning and tracking have greatly enhanced the rescue capabilities of rescue boats. International cooperation has become a trend. The large-scale submarine rescue exercise held by NATO focuses on the rapid deployment of key components of the NATO submarine rescue system and its ability to conduct deep-sea rescue. The participating NATO countries' navies and military enterprises joined forces to complete various key equipment exercises in a relatively short period of time. One of the exercises highlighted the theme of international cooperation in responding to submarine disasters. The exercise showcased the latest technology of rescue boats and related equipment for submarine rescue, with a focus on international cooperation in submarine rescue and emergency response actions in complex scenarios. The International Submarine Escape and Rescue Liaison Organization was established under the leadership of NATO to promote international rescue operations and enhance aid capabilities. Currently, the organization has over 40 member countries and serves as an international rescue force supporting global maritime disaster relief efforts. This rescue exercise shows that it is difficult for a single country to carry out submarine rescue operations alone, and more will be jointly undertaken by multiple countries. The purpose of this exercise is also to strengthen cooperation, jointly develop advanced submarine rescue ships, equipment, and technology, and further enhance the joint rescue capability for submarines. (New Society)