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How do Pandanus fruits float in water?

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Screw pine (Pandanus tectorius) — Pandanales Screw pine (*Pandanus tectorius*)

The fruits of Pandanus species, which belong to the order Pandanales, are typically heavy, ball-shaped or conelike aggregates formed by the coalescence of many individual ovaries. These fruits are able to float in water because they contain internal hollow spaces, which facilitates their dispersal across coastal regions.1