The Ark-17 is one of a fleet of numbered Autobot starships designated Ark. They are presumably named after the first legendary lost Ark.
IDW comics continuity
Springer used the Ark-17 as a platform from which he launched his operation to rescue Kup. The ship housed seemingly endless hordes of Autobots that Springer threw at the crazy and powerful Kup. Eventually, Trailbreaker rendezvoused with the Ark-17, and he easily rescued the old coot.