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The trickiest part of building the fish bombs is constructing the fuse, which is made of the flat, malleable aluminum from a tube of toothpaste. Priming mixture is "diluted" with crushed matchheads and the aluminum sheet is rolled around it like a cigaret. The aluminum makes the fuse waterproof; heat and combustion gases keep the water from rushing in the open end. Different lengths of this waterproof fuse are used depending on how deep the fisherman wants the bomb to go before exploding.

The fuse is attached to a standard beer bottle—or a large ale bottle, or a small medicine bottle—with coconut husk rope and pitch. The whole package is stuffed into a papaya, and thrown over board. According to the report, fish bombers off the south coast of Biak near the airport time their bombs with the noisy arrival of the Garuda flight, which effectively masks the explosion.

Today, the supply of cordite and gun-powder has for the most part disappeared. Unfortunately, the clever fishermen have now discovered how to make bombs using ingredients found in widely available chemical fertilizers.