cage diving
noun [ U ] uk/ˈkeɪdʒ ˌdaɪ.vɪŋ/ us/ˈkeɪdʒ ˌdaɪ.vɪŋ/
笼中观鲨（潜水旅游项目，将潜水者置于铁笼中，与鲨鱼近距离接触）
an activity in which people are taken underwater in a cage so that they can see sharks (= very large fish with sharp teeth) swimming near them
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