请帮我解释下这个英文句子的中某个词的意思,

请帮我解释下这个英文句子的中某个词的意思,
In a breakthrough that could prove hugely beneficial （prove后面为什么接的是形容词?）to divers navigating shark-filled waters,scientists found that the predator is unable to distinguish between colours,the German nature journal Naturwissenschaften reports.