User blog comment:D.Ryan/Was Subject Delta actually in BioShock 1 ?/@comment-1784740-20100103232025

I think that it is Delta cuz Delta was the first big daddy to successfully be bonded to a little sister. And the drill that is in Dr Suchong is delta's drill cuz in the beginning of bioshock 2 delta has to pull a drill of a dead big daddy bouncer.