Qianting Zongdongyuan 6: Haidi Liang Wanli

Synopsis

There have been successive incidents of mysterious sea monsters destroying merchant ships around the world, causing panic and rumors that the ocean is facing disaster. The submarine Ali decided to gather partners to track the "sea monster", but found that the "sea monster" is a technological submarine that uses "environmental protection" as an excuse to carry out evil plans. In order to solve these mysteries, Ali and his friends used the knowledge they learned to start a 20,000-mile roaming expedition under the sea. (translated from douban)