PvE Temporal: Days of Doom broken

We had a good crew, well placed warp cores........ had no effect, I even dug up my old Harpang Torp to shot down it's gully...... no effect........
The Harpang Torp should kill that sucker in about 5 shots but did NOTHING...... perfect shot every time.
No matter what we did, the Doomsday Machine remained at 100%........ thus no extra marks .......