Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In 1973, Daniel and Lena, a young German couple, become entangled in a Chilean military coup at a time when supporters of deposed President Salvador Allende are getting rounded up by the military under General Augusto Pinochet. When Daniel is abducted by Pinochet's secret police DINA, Lena tries to find and save her boyfriend. She tracks him to a sealed-off organization called "Colonia Dignidad", which presents itself as a charitable mission run by a lay preacher, Paul Schafer. Lena joins the organization to rescue her boyfriend, only to learn it is a cult from which no one has ever escaped. She later finds Daniel, who acts disabled to be overlooked. Daniel discovers the organization is also an illegal operations center for DINA. Lena and Daniel attempt to escape from Colonia Dignidad along with Ursel, a pregnant nurse. Ursel is killed and both Lena and Daniel escape to the West German embassy. Staff from the embassy betray them but the lovers exit the country by air, with incriminating photographic evidence against Colonia Dignidad.
Who is betrayed by embassy staff?