Ballistic Missile Submarines (SSBNs) are a type of military submarine designed to carry and launch nuclear ballistic missiles. They operate stealthily underwater, making them difficult to detect. SSBNs play a crucial role in a country's nuclear deterrent strategy, ensuring that a retaliatory strike is possible even after a surprise attack. These submarines are typically equipped with multiple missile launch tubes and can remain submerged for extended periods, often months at a time. The ability to launch missiles from underwater provides a strategic advantage, as it enhances survivability and complicates enemy targeting efforts.