Seehund (Seal) is a class of remotely operated mine countermeasures drones in the German Navy. Part of the HFG-F1 Troika MCM system, they originally entered service in 1980. Seehunds use acoustic and magnetic coils to simulate the signature of a larger vessel to detonate mines. Like the Chinese Futi, the vessels can be optionally driven by three crewmen in restricted waters. They were employed operationally in Kuwait during the 1991 Gulf War.