“Find a place to secure a transmat zone for the Tower.”
Head through the room and forward through the Dreadnaught. Go through the next chamber. When you emerge, turn to the right and head for the breach in the wall ahead of you. You will see some Hive emerging from that breach. Clear them out and then head on through it. Go along the passage to the next large chamber. This leads you to the Hull Breach.
You can see that there is a Cabal ship nearby. For now, let the ship be. The Cabal and the Hive are fighting. Let them tear into each other. Turn to the left and head toward the breach in the hull of the Dreadnaught.