Jules' Undersea Lodge Chalupa Research Laboratory, an undersea marine lab operated off Puerto Rico in the 1970s. The lodge features a 2 bedroom 1 bath retreat that can be rented for a night. The hotel also offers a scuba diving school. Jules' Undersea Lodge Jules' Undersea Lodge is an American hotel located in Key Largo, Florida and is the only underwater hotel in the United States. It is 30 feet (9 m) deep on the ocean floor and guests have to scuba dive to get to their rooms. The hotel is located at the bottom of the Emerald Lagoon and was opened in
San Juan, Puerto Rico de Santa Catalina, also known as La Fortaleza, which serves as the governor's mansion. Other buildings of interest predating the 20th century are the "Ayuntamiento or Alcaldía" (City Hall), the "Diputación Provincial" and the "Real Intendencia" buildings, which currently house the Puerto Rico Department of State, the Casa Rosa, the San José Church (1523) and the adjacent Hotel El Convento, the former house of the Ponce de León family known as Casa Blanca, the Teatro Tapia, the former Spanish barracks (now Museum of Ballajá), "La Princesa" (former municipal jail, now headquartering the Puerto Rico Tourism Company), and the Santa María