- B/W sound
- 10 min
Climbing and Speleology in the Duranguesado (Vizcaya), Belgian cavities (diving in Hans sur Lesse), Italy (biospeleology in Grutas de Vei), Cueva de los Enebralejos de Prádena (Segovia) and Gruta de Chontalcuatlán (Mexico). The film is an episode of the 'Imágenes' series from the NO-DO, the state-controlled series of cinema newsreels produced in Spain during the Francisco Franco's dictatorial regime.
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