screenwriter Eugène Lourié had worked for the film's producers as art and special-effects director for the 1965 movie Crack in the World, and they hired him to create the special effects for Krakatoa, East of Java. In 1965, Lourié scouted the coast of Spain for a suitable steamer for use in the film as the fictional Batavia Queen; ultimately he chose a cargo ship – a former passenger-cargo ship employed as a tramp steamer between Spain and Morocco – he found unloading coal at a pier in Bilbao whose captain said she had been built in England sometime around 1880. Lourié had the steamer remodeled in Málaga, Spain, at a shipyard which transformed her into the Batavia Queen by increasing the height of her funnel and masts and installing new yards on her masts and a new bowsprit and carved wooden figurehead on her bow. The steamer also was provided with functioning sails for her masts and yards. For special effects, Lourié's team constructed two models of the modified steamer, a one-to-ten-scale model that was long, and, for long shots of the Batavia Queen as she approaches Krakatoa, a one-to-twenty-scale model. The latter proved too small to provide realistic effects, so Lourié chose not to use it in the film, instead using only the larger model. After considering a water tank in Malta, Lourié chose the water tank he had used for the 1964 film Flight from Ashiya at Cinecittà in Rome to film special effects sequences depicting the Batavia Queen at sea. The tank was approximately in area and had a sky backing of . The sequences were filmed using three Super Panavision 70 cameras running at three times normal speed to make the movements of the miniatures more realistic, although the cameras were not designed for such work and often overheated and required repairs. Lourié tried to disguise the miniature Batavia Queens lack of a crew or passengers as she gets underway for Palembang, slowly picking her way through a narrow passage under a rain of lava bombs while Krakatoa erupts nearby, by enveloping her in smoke. For the final sequence in which the Batavia Queen rides out a very large tsunami at sea, Lourié's team spent three days filming the model in the water tank in extreme conditions, creating large waves through the use of dump tanks with a capacity of 2,600 gallons (9,800 liters), spraying water