Echo-1 is a military ship that ferries weapons and armory from one planet to another. It obviously has been in use for a very long time due to its role in carrying the Frozen Death. It was the ship that was attacked by the aliens and crashed onto a planet. This ship was carrying a Frozen Death, which was used by the aliens. It must have an airlock to dock with other ships.
The Echo-1 is an interplanetary ship, a transport ship that is an SSTO, (Single stage to orbit) and has a huge durability, as even though aliens zapped the ship, and only broke into half, and survived the fall onto the unknown planet.