Maersk and the U.S. Navy collaborate on biofuel initiative. Maersk and the U.S. Navy are testing algae-based biofuel on the container ship Maersk Kalmar. The ship is en route from Northern Europe to India. Maersk Kalmar has two key attributes that make it a suitable vessel for biofuel testing. The 300 meter-long container ship has a dedicated auxiliary test engine, which reduces the risks of testing, and its fuels system has a special biofuel blending equipment and separate tanks.