Metal shipping containers, commonly used for transporting goods via sea, do have the ability to float under certain conditions. The design of these containers often includes airtight seals and welded seams, making them relatively watertight. In the event of a maritime accident, such as a ship capsizing or containers falling overboard, the buoyancy of the container allows it to float on the water's surface. However, it's important to note that the buoyancy of a container can vary depending on several factors, including the weight of the cargo inside, the condition of the container, and external factors like waves and currents. While metal shipping containers can float, their stability and ability to remain afloat can be affected by the conditions they are exposed to during a maritime incident.