Evolution of the theory of the Black Hole:
1. Classical theory – a matter and information fall under Event Horizon into a singularity for ever.
2. Hawking model – a Black Hole may evaporate by Hawking Radiation.
3. Horovitz=Maldacena model – a final state boundary condition at Black Hole singularities – an information may go out from a Black Hole. http://www.arxiv.org/abs/hep-th/0310281
In a very strong gravity close to heavy object we observe time dilation , length contraction and energy increase. Theoretically on the Event Horizon a time should stops , length collapse into zero point and energy increase to infinity – people call it singularity.
Practically is it not possible because of a natural space-time boundary. If there would be an isolated object collapsing inwards – it would be a singularity in the future eternity.
If there is an energy (matter) supply and its mass grows a matter will be collected above a theoretical Event Horizon. The Maximal Energy would be when all the particles move close above an Event Horizon with a speed close of light. This causes a light sphere around an heavy object.
For an outer observer the outer surface of the Black Hole shine bright but from inside is coming strong high redshifted radiation (Radio waves).
Any way the inside sphere is not cut off from en outer observer.
For inner observer – the most farthest space move almost with speed of light and the radiation from this distance is also maximal redshifted.
The matter (energy) is concentrated mostly on the sphere close above a theoretical Event Horizon. We may say a singularity is a sphere, not a point. It seems crazy but as for rotating Black Hole a final singularity is a ring , for a spherical Black Hole should be an empty sphere.