The sea of menace

Be a part of creating the story with this quiz-tastic puzzle book! You are on the explorer ship Crystal Searcher. Your friends have come off their sub-bike and you must find and save them, then discover the secret of the sunken Crystal City. But beware! The Sea of Menace is full of dangers - twisting whirlpools, toxic waste, shocktopuses and mer-monsters await you...can you achieve your goal - and survive?