Give Survivors a very slight sense of hope with a hatch.
Everything's going wrong. All your friends are dead and the timers ticking down tick tock tick tock.
You stumble upon the hatch but it's shut tight.
When you are the last survivor and end game collapse has begun. The final survivor can attempt to pull open the hatch.
The hatch is sealed tight but the entity feeds on your fear and dread. In the final minutes of endgame the entity becomes numb and the hatch is able to be pulled open if you hold the action button and hit the difficult skill check which has a 5% chance of appearing.
Consequences of hitting skill check- the hatch door Breaks off and you jump in while you can.
Consequence of missing the skill check (if you are lucky enough to get one) - Gigantic furry entity claws penetrate the hatch and pull you in. This is not a hatch escape. This is death. The hatch shuts after you are pulled in and the hatch disappears into the ground leaving nothing but a pool of blood behind.
The closer the killer is the increasingly likely you are to receive this skill check to break open the hatch. It calls for more clutch escapes from certain death. Take note that the chance of recieving this skill check is a maximum of 10%. This figure is only used if you've been holding action for a while. Also remember the skill check must be hit to escape. If it's not then the survivor will die and the killer can watch it happen.
I've seen a lot of backlash over the end game collapse being too advantageous to killers who have closed the hatch.
I think giving survivors a very slight chance of survival when they have no hope is fun. They don't get a free win, and arguably killer can patrol both doors and the hatch rather than the 2 doors.
My ideas a little long winded but it's an idea which I think would be fun. An example more than something which I think should be added.