What is Limbo?
According to one of the Catholic theologies, Limbo is described as periphery to hell. People who are not assigned to hell and have died in original sin, have to bide their time in Limbo. In the movie it is explained as a state in the dream where dreamers end up while trying to go too deep into dream levels or by getting killed in the dream under heavy sedation. It’s an unconstructed dream space of raw infinite subconscious which seems more real than reality itself. Here time runs fast enough for one to lose his/her mind.
What happens when one dies in a dream?
If one dies in a dream, he wakes up to the level above (wakes up to reality if dies in a single level dream). In the opening sequence Cobb shoots Arthur while on an extraction mission and Arthur wakes up on the 1st level. This is true for any normal sedative induced dream. Since the Inception involved going to the 3rd level of dream, it required a special strong sedative, with possible side effects. One such side effect was, if a person dies in the dream, he would end up in Limbo.
Is Limbo like being in Comma?
No, limbo is not a state ad infinitum (comma). One gets out of limbo as soon as the sedation wears off. But since in limbo time runs very quickly, mind tends to burn out, even couple of hours of real time would seem like eternity and one might end up insane.
Is Limbo a shared state?
Limbo is indeed a shared state. As stated in the movie, Limbo would be empty except for the things left by someone who had already been there. Hence near the end of the movie, when Adrain and Cobb went to Limbo they found the world which Mal and Cobb had created there earlier. It does not mean that people in two different dreams altogether, will share the limbo. Only the people physically connected by the PASIV device, sharing a single dream will share the Limbo.
How to reach the Limbo?
1. By getting killed in the dream under strong sedative.
Saito and Fischer got killed and reached Limbo.
2. By trying to go deeper and deeper and states getting unstable
a) Cobb and Mal tried going deeper and deeper and reached Limbo where boundaries between reality and dream vanished.
b) On the snow fortress level, Cobb and Adrian tried going deeper from an already unstable state and reached Limbo. (rememeber, the sedative they took could just take them to Level 3, which too seemed unstable). Adrian explained to Cobb that they needed to go deeper to get Fischer back. They found Mal there (Cobb stated that he had created her projection in Limbo over the period of time from the memories he had of her) who was keeping Fischer captive. They also found the world created by Mal and Cob in Limbo as explained earlier.
How to get out of Limbo?
1. If you kill yourself, you wake up to the real world. (Mal and Cobb committed suicide on the railway track and woke up to reality).
2. Get your own kick in Limbo (free fall for Fischer and Adrian) with the kick on any level above (like using the defibrillator in snow fortress for Fischer). These two synchronized events will take you to the level from where the kick was engineered. Fischer and Adrain got out of it this way in the end.
Why didn’t they try to bring Saito back from Limbo just like Fischer?
Saito could have been brought back just like Fischer with synchronized kicks. But it would have been worthless to the mission. Fischer was important and time was running out. So Adrian and Cobb first found Fischer. He was easy to spot since Cobb knew that Mal’s projection would have captured Fischer to force Cobb to come after her. He went to the place in Limbo (their own apartment) where he could find Mal and thus found Fischer. Meanwhile the kicks started taking effect. There was not much time for them to find Saito. Adrian and Fischer went back and Cobb stayed behind to look for him.
How did Cobb end up again on sea shore and hadn’t aged a bit?
One wakes up on the sea shore when arrive in Limbo. Cobb and Adrian woke up there when they got to Limbo to rescue Fischer. Adrian and Fischer left, leaving Cobb behind to find Saito. Considerable time would have passed during his search for Saito. He should have aged in accordance that time runs pretty fast in Limbo. However he ended up again at the sea shore, un-aged. What happened was, Adrian left Cobb in Limbo and came back eventually to Level 1 where Saito and Cobb were left in the drowning car. Saito was already dead by then but Cobb was alive. He died again due to drowning and his new projection entered Limbo (re-entered). Hence he ended up again at the shore un-aged.
P.S: Queries and Discussion Invited
