What is the fine-grained topic of the following text: They’ve long been avid fans of his Deadly 60 children’s TV programmes, so there was no way they were going to miss seeing the death-defying explorer-naturalist braving rapids and leech-infested jungles to search for tigers in Bhutan. Only return the topic.
Watching a Deadly 60 children's TV programme featuring an explorer-naturalist searching for tigers in Bhutan.