Assertion: diver's diving | /r/Synonym | cavern diving
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Source sentences:
text: While a less-intensive kind of diving called cavern diving does not take divers beyond the reach of natural light (and typically no deeper than 30 metres (100 feet)), and penetration not further than 60 m (200 ft), true cave diving can involve penetrations of many thousands of feet, well beyond the reach of sunlight.