Hundred Days Under Sea

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**Hundred Days Under Sea**, or **100dus**, is an open-source 3D underwater sea life and scenery application for Linux. It creates a living underwater world with animated fish, sea animals, underwater landscapes, imported 3D models, presets, and a modern setup interface.

New in November 2026: 100DUS Habitats is a separate application inspired by classic screensavers. Explore four fully 3D habitats with five camera positions each, or enjoy an automatic tour through all four. Habitats can start after a period of inactivity and runs well on older hardware.

100dus is free and open-source software. The source code and included assets are distributed under the licenses listed in the project files.