What is the name of the building where Sailors live?

The building where Sailors live is known as the barracks. This facility is specifically designed to provide accommodations for military personnel, offering sleeping quarters along with communal areas for relaxation and social activities. Barracks typically include amenities such as shared bathrooms, laundry facilities, and sometimes kitchens for preparing light meals. Living in barracks fosters camaraderie and a sense of community among Sailors, which is essential for teamwork and morale in military environments.

The other terms refer to different types of facilities: cabins usually imply more private or vacation-style accommodations and are not standard for military living; mess halls are dedicated to meal service and dining, and docks refer to structures for mooring or repairing ships, neither of which are related to living accommodations for Sailors. Therefore, barracks is the correct answer as it accurately describes the primary residential facility for Sailors.