價格：免費
檔案大小：856.5 MB
版本需求：需要 iOS 8.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
You are a submarine captain, and are traveling inside a cave under a very deep ocean 5000m below sea level. This extreme depth mean visual navigation is extremely hard. Fortunately you are equipped with a high technology sonar that can transmit ultra sonic wave to detect terrain. However it takes time for it to charge up and be ready to fire again. Navigate as far as you can and avoid collision with the caves and explore the ocean ambient atmosphere.
支援平台：iPhone, iPad