Question: did robert langdon die in the lost symbol

Answer: No, Mal'akh places Langdon into an airtight sensory deprivation tank, where he interrogates Langdon by slowly filling the tank with liquid. He is able to convince Langdon to decipher the code at the pyramid's base, but continues to fill the tank until Langdon drowns and apparently dies. Mal'akh then ties Katherine to a chair and inserts an open-ended transfusion needle into her arm and leaves her to bleed to death then flees with a weakened and wheelchair-bound Peter Solomon to the Temple Room of the Scottish Rite's House of the Temple. He uses the threat of not calling an ambulance for Katherine as further coercion for Peter's cooperation. Sato leads a team of agents to the mansion after Langdon and Katherine's escort fails to check in and are able to save Katherine's life. After a near-death experience, Langdon is revealed to have survived due to the ``water'' in the tank actually being breathable oxygenated liquid and the tank being a device for meditation. Sato, Langdon and Simkins race to the House of the Temple where Mal'akh threatens to release a heavily edited video showing government officials performing secret Masonic rituals (the same video that Sato showed to Bellamy), which without context, appears highly disturbing. Mal'akh forces the Word--the unpronounceable circumpunct--out of Peter and tattoos it on his head on the last portion of unmarked skin on his body. Mal'akh then orders Peter to sacrifice him, as he believes that it is his destiny to become a demonic spirit and lead the forces of evil. When Peter claims that he will do so without hesitation to avenge his son and mother, Mal'akh shocks Peter by revealing that he is actually Zachary Solomon himself, having conspired with the prison warden to fake his death by disfiguring the body of another inmate beyond recognition (at the same time, Katherine and Bellamy discover several photos of Zachary in Greece after his supposed death that show his gradual transformation into Mal'akh). With tears in his eyes, Peter prepares to stab Zachary but ultimately cannot bring himself to do so and drops the knife just as Langdon arrives and tackles him. Director Sato arrives at the Temple in a helicopter, which smashes the Temple's skylight, the shards of which fatally impale Zachary. The CIA then thwart Zachary's plan to transmit the video to several leading media channels using an EMP blast, disabling a cell tower in the network path leading from Zachary's laptop computer. Katherine arrives and she and Langdon then share a tearful reunion with Peter and mourn Zachary's death. Zachary is only briefly able to lament his body's mutilation before dying.