Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Bikini Atoll Nuclear Test Site' has mentioned 'Reef' in the following places:
Occurrence Sentence Text Source
The United States detonated 23 nuclear devices between 1946 and 1958 at seven test sites on the reef, inside the atoll, in the air, and underwater.
To allow vessels with a larger draft to enter the lagoon and to prepare for the atomic bomb testing, the United States used explosives to cut a channel through the reef and to blow up large coral heads in the lagoon.
The test weapons were detonated on the reef itself, on the sea, in the air and underwater[16] with a combined fission yield of 42.2xc2xa0Mt.
They were poisonous because of what they ate on the reef.
The reefs attract reef fish and their predators: 30 pounds (14xc2xa0kg) dogtooth tuna, 20 pounds (9.1xc2xa0kg) barracuda, and giant trevally as big as 50 pounds (23xc2xa0kg).