The ultimate fate of Cell 1138 is still unknown. The area which 1138 was holding, a Loading Bay turned into a killzone, was heavily bombarded by combined Basilisks and Venidcator Seige Tanks.
Depected her is the 'leader' of Cell 1138, Dagan. Little is know of this Traitor Astarte however it is assumed he was in command as Vox traffic should the call sign 'Dagan' giving orders. However this could be a ruse.
Pics recovered from Dark Angels recon squad Torrance show Dagen lacking full plate. It is assumed his armor was made from other marks of armor.