HAVANA (AP) — A second deep-water exploratory well in the Gulf of Mexico has proved a bust, Cuba’s state oil company announced Monday, dealing another blow to the island’s dreams of petroleum riches.

The drilling operation carried out by PC Gulf, a subsidiary of Malaysia’s Petronas, and Gazpromneft of Russia, concluded July 31 off the western province of Pinar del Rio, Cuba’s state oil company Cubapetroleo said in a statement.