Juan Maldacena proposes a non-perturbative dual description for maximally extended Schwarzschild Anti-de-Sitter (AdS) spacetimes using two copies of the conformal field theory (CFT) associated with the AdS spacetime and an initial entangled state. This description addresses the information loss paradox in black holes and suggests that the interior of black holes, including regions near singularities, can be described holographically. The proposal is based on Israel's description of eternal black holes and is supported by the AdS/CFT correspondence. The paper discusses the construction of the initial wavefunction in the boundary CFT, which is a sum over states in two copies of the CFT, and shows that information can be preserved after summing over geometries. The author also explores the implications of this holographic description for the information loss paradox, demonstrating that correlations decay exponentially but can be restored by summing over all possible geometries. The paper concludes by highlighting the cosmological nature of these spacetimes and the potential for local processes in the interior to be described in terms of the boundary theory.Juan Maldacena proposes a non-perturbative dual description for maximally extended Schwarzschild Anti-de-Sitter (AdS) spacetimes using two copies of the conformal field theory (CFT) associated with the AdS spacetime and an initial entangled state. This description addresses the information loss paradox in black holes and suggests that the interior of black holes, including regions near singularities, can be described holographically. The proposal is based on Israel's description of eternal black holes and is supported by the AdS/CFT correspondence. The paper discusses the construction of the initial wavefunction in the boundary CFT, which is a sum over states in two copies of the CFT, and shows that information can be preserved after summing over geometries. The author also explores the implications of this holographic description for the information loss paradox, demonstrating that correlations decay exponentially but can be restored by summing over all possible geometries. The paper concludes by highlighting the cosmological nature of these spacetimes and the potential for local processes in the interior to be described in terms of the boundary theory.