In 1927 he organised, together with his son and the also Spanish explorer Fèlix Cardona i Puig, an expedition to the southwest of Venezuela starting in San Pedro de las Bocas, tracing back the rivers Caroni and Caruao until they arrived to the Auyán-tepui, discovering the waterfall known nowadays by the name Angel Falls (in honour of pilot Jimmie Angel, but in the native tongue were designated as Churun Merú). This waterfall has more than 1 km of height and is the highest in the world.
