Soon the demand for cocaine in the United States increased. Escobar started to organize more smuggling ships and routes. He also improved the sale networks in South Florida, California and other parts of the USA. Escobar and Carlos Lehder worked together to develop a new drug center in the Bahamas, called Norman's Cay. Lehder and Robert Vesco bought most of the land on the island. This included an airstrip, a harbor, hotels, houses and boats. They also built a warehouse to store the cocaine. From 1978 to 1982, this was used as a central smuggling route for the Medellín Cartel. Escobar bought of land, which included Hacienda Napoles, for several million dollars. He created a zoo, a lake and other things for his family and organization. At one point, about 70 to 80 tons of cocaine were brought from Colombia to the United States every month. At the peak of Escobar's power in the mid-1980s, he sent about 11 tonnes per flight in planes to the United States. In addition to using the planes, Roberto Escobar said he also used two small submarines to transport the massive loads.