The exercise, named Dynamic Mongoose, takes place every two years and is designed to improve the interoperability of NATO's submarine forces and their ability to operate in the challenging Arctic environment.
This year's exercise involves submarines from six NATO countries, including the United States, the United Kingdom, France, Germany, Norway, and Canada.
The submarines are equipped with various sonar systems, including active sonar, which emits sound waves to detect objects in the water, and passive sonar, which listens for sound waves from submarines and other vessels.
During the exercise, the submarines sail under the ice and use their sonar systems to detect and track each other.
They also practice communicating with each other underwater, using acoustic communications systems that can bypass the ice cover.
The Arctic is becoming increasingly important for NATO, as Russia expands its military presence in the region.
Russia has built new military bases in the Arctic and has been conducting military exercises near NATO borders.
In response, NATO has beefed up its presence in the Arctic, including increasing its naval exercises and patrols.
The Dynamic Mongoose exercise is part of NATO's efforts to improve its Arctic capabilities and ensure that the alliance can operate effectively in this harsh and challenging environment.
