This, I believe, is a clue:
Expedition Log: 21/08/3270
"Why the hell are we out here? No one seems to know. It's taken months and still we're not there. Wherever 'there' is. We're dropping these beacons. Supposedly nobody knows what they're for. If they do they ain't telling. Makes no sense, there's nothing out there... and who would come all this way anyway?"
Expedition Log: 28/08/3270
"We're still travelling. Jump drive malfunctioned today, that made an interesting diversion. It's going to take a while to fix. This area of space is g me out. Could have I heard some weird voices in the last jump. We are a long way from home. We're struggling to plot a course now, we're leaving the galactic arm and the jumps are getting longer."
Expedition Log 07/09/3270
"Finally fixed the drive, more monotony. Can't believe it's nearly six months sice we set out from Riedquat. Did I say Riedquat? I meant Reorte. It's getting to me, this endless emptiness. The guys are showing the strain. Three more months before we can turn and head back. The stars are thinning out, you can the whole galaxy just hanging there..."
Expedition Log 22/09/3270
"The darkness grows. The galaxy is faint and dim behind us. I'm told this place has been nicknamed the Formidine Rift. Apparently that means fear in some old Earth language. It's an apt name, some of the guys are going space crazy out here in the void. We had to sedate one guy, he went completely doolally. We've not seen another soul for weeks. Just us and this ship... alone... in the darkness..."
Expedition Log 07/10/3270
"I'm scared... help me someone... I can't bear another jump. The lights in witch-space are coming for me. The lights... always the lights... they're calling to me... a siren song... I must join them..."
Expedition Log 08/10/3270
AUTOMATED TELEMETRY REPORT: CANOPY BLAST BOLTS ACTIVATED. LIFE SUPPORT MALFUNCTION. CREW VITAL SIGNS TERMINATED. SHIP SYSTEMS ENGAGING STANDBY MODE. DISTRESS BEACON ACTIVATED.
There's something out there which messes with peoples' minds.
That's what we need to be afraid of.