This is the story of Bioshock 2, with its own Equestrian twist.

Ten years after his apparent death during that fateful Festival of Friendship, a mechanical known only as Delta is rejuvenated by an unknown force. Finding himself in the bogged ruins of the city, Delta embarks on a journey to find his long-lost Spark.

It has been nine years since the arrival of Bluejacket in the forgotten metropolis of Seaquestria, but life still persists in the sunken depths of the city. Life that is dangerous and seeks to obtain "friendship" by any means necessary.