The immediate, existential threat creates an accelerated bonding process, often referred to by psychologists as "traumatic bonding" or the misattribution of arousal. Mechanics of Entwined Fate
What is it about tunnels specifically that creates such powerful bonds between people? Psychologists point to several factors: tunnel escape fate entwined
This is the first layer of entwining: . There is no solo act in a tunnel. tunnel escape fate entwined