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Used to create loud noises that could signal ships. Constructed from hollowed tree trunks reinforced with metal bands and filled with black powder.

Used to warn of approaching danger or unauthorized entry. Constructed with trip wires connected to noisy elements like bells or cans.

Used to communicate across distances on the island. Constructed with a series of hollow bamboo tubes that transmitted sound.

Used for grinding grain into flour. Constructed using the flowing water from a stream to turn a wheel attached to a grinding stone.

Used to collect fresh water from the air. Constructed with a series of cold surfaces where water vapor can condense and be collected.

Used to extract juice from sugarcane. Constructed with heavy rollers pressed tightly against each other, turned by animal or water power.

Used for lifting heavy objects. Constructed with ropes and wheels attached to beams or tree branches.

Used to provide water to crops. Constructed using diverted streams, channels, and possibly bamboo pipes to distribute water.

Used as a safe and elevated shelter. Constructed using strong branches to support floors and walls woven from plant fibers.

Used for passive fishing. Constructed with a cage or net with an entrance that allows fish in but not out.

Used to extract metals from ores. Constructed by heating up a chamber to very high temperatures where metal ores are melted and separated.

Used to extract salt from seawater. Constructed by creating shallow ponds near the sea and allowing the water to evaporate.

Used to harness wind energy for various tasks, such as pumping water. Constructed with large sails attached to a rotating cap.

Provides a crossing over streams or gorges. Constructed with ropes and wooden planks, and secured to trees or stakes on either side.