I had all 4 survivors in the vehicle after it broke through in the finale. But it wouldn't recognize it and I couldn't complete the map.

Just got the loop of the voice telling me to get on board every few seconds.

Otherwise, it's an interesting map.

Well looking into that , it might be the same bug why the radio button didn't work. There is a trigger_multiple entity which is supposed to check every 1 second and fire off when all survivors are inside its volume. But sometimes it just fails to work, you have to walk out of the trigger then walk back in to reset it. So to fix this I could send a Enable/Disable requests on in a timer interval to reset it. I'll put that fix into it for the next update.