During a training mission, a torpedo on board the Kursk leaks hydrogen peroxide. It reacts with iron oxide (rust) in the bow and blasts the front of the submarine. Although the submarine has explosion-proof walls, the explosion spreads through the ventilation shafts, killing everyone at the command post and preventing the sub from performing an emergency blow. 135 seconds later, another explosion rocks the submarine. Then it sinks, killing all but 23 men on board. While the survivors wait to be rescued, special boards that produce breathing oxygen with potassium superoxide drop into the oily floor, starting a reaction that creates a fire, killing them as well. Running time: 46 min. Country: United States. United Kingdom Director: Russell Eatough Music: Steven Faux, Graham Reilly Producer: National Geographic Channel Genre: TV Series. Documentary. Historical documentaries

En un islote plano cubierto de almajos, en pleno mar del coral venezolano, anidan los alcatraces pardos. La biología reproductora de la inmensa colonia, constituye el tema de este capítulo de "El hombre y la Tierra". Para un europeo, explica Félix Rodríguez de la Fuente, "un hombre acostumbrado al temor de los animales ante su presencia, lo más sorprendente es la tranquilidad con la que estos alcatraces acogen a estos nuevos 'animales'".