The Zalkonian escape pod was a small craft designed for safe escape from Zalkonian vessels in case of emergency. Part of the computer system of the Zalkonian escape pod consisted of small gel-filled capsules.
In 2366, the Zalkonian known as "John Doe" used one of these escape pods to leave a ship he was using to escape Zalkon that was attacked. "John Doe's" escape pod later crashlanded on an unknown planet in the Zeta Gelis Cluster. When found by the USS Enterprise-D, "John Doe" was rescued from the pod and a single computer capsule was salvaged from the wreckage. (TNG: "Transfigurations")