Slitherine

I've tried getting past Sister Verity mission several times now and I always end up having killed all the tyranids just sitting there end turning forever.

I believe the crashed shuttle should explode but it never does and the mission never completes.

Is there any cheat codes to complete the mission as if I have to start it again ill just give up at this point as this is the 9th attempt at completing it only to get stuck having killed all the tyranids and just clicking end turn forever.

Thanks in advance