A bright, science-minded boy goes to the beach equipped to collect and examine flotsam-anything floating that has been washed ashore. Bottles, lost toys, small objects of every description are among his usual finds. But there's no way he could have prepared for one particular discovery: a barnacle-encrusted underwater camera, with its own secrets to share . . . and to keep.

小男孩跟著父母親來到海灘，隨身帶了放大鏡、顯微鏡，想要研究海灘上的生物。
他無意間發現一個水中照相機，便把裡面的底片拿去沖洗，沒想到洗出來的照片裡竟出現了許多不可思議的畫面，像是機器魚、大章魚唸書給小章魚聽、河豚變成熱汽球載著魚而飛上天、還有超迷你外星人在海底做研究……，藍綠色海浪下面的海底到底是什麼樣的世界？
詭異的是，男孩發現一張照片裡有個女孩，女孩手裡拿著一張照片，照片裡的男孩手裡又拿著一張照片！這到底是怎麼回事？ -----------轉至格林文化簡介