The Sigma is a small interstellar class of spaceship used by the Rescue Bot team Rescue Force Sigma-17. Its max velocity drive provides faster-than-light travel, and it has stasis pods so that the crew can travel while in stasis. The ship's capabilities also include a cloaking shield, which can render it invisible.Sense the beginning of rescue bots academy Series bumblebee has sense got his own sigma ship separate from the sigma 17 rescue bots sigma.