within thirty seconds. Lorenz said she had a change of heart on returning to the hotel, only to then discover that the plan was a failure, as the pills had dissolved in the container of cold cream she had hidden them in. She said that Castro then revealed he knew she was there to kill him, but that he also knew she couldn't go through with it. Afterwards, she claims they made love in his suite in the hotel, before she returned to the US. Hotel Habana Libre The hotel remained in operation as a Hilton while relations between the US and Cuba worsened, until June 11, 1960, when the Cuban government nationalized the property. On June 15, 1960, Castro announced in a speech to the Restaurant and Hotel Workers Federation that he was renaming the hotel the Hotel Habana Libre (Hotel Free Havana). That year, Hilton Hotels International, Inc. wrote off $1,854,575 that had been invested in the Cuban subsidiary that operated the hotel. The first Soviet embassy in Havana was soon temporarily established on two floors of the hotel. In March 1963, Castro is reputed to have survived another assassination attempt at the hotel, by the US Mafia and the CIA. Cuban intelligence chief Fabian Escalante claimed that a poison pill was to have been slipped into one of the chocolate milkshakes Castro regularly ordered in the hotel's cafeteria, and that Castro was saved only because the pill became stuck to the hotel's kitchen freezer that it was hidden in, and that the pill broke open as the would-be assassin tried to remove it from the ice. Escalante called it "the closest the CIA got to assassinating Fidel." In 1964, Soviet female cosmonaut Valentina Tereshkova, the first woman in space, gave a press conference at the hotel. From January 3–12, 1966, the Habana Libre hosted the first Tricontinental Conference of Asian, African and Latin-American peoples. Fidel Castro stayed in the hotel's Castellana Suite, room 2224, during the conference, and made the suite his home thereafter for all major diplomatic events. The suite is now kept as a museum, with all the original furniture and artwork from 1958. From October 23-November 20, 1966, the Habana Libre hosted the 17th Chess Olympiad, with guests including Bobby Fischer and Boris Spassky. In 1967, the hotel hosted Marxist Chilean politician Salvador Allende. Following the collapse of the Soviet Union, the Cuban government