The Baltic Sea has very low levels of salt compared to most oceans, and also, has almost no tidal movements, which makes it the ideal underwater spot for preserving ancient mysteries.

与大多数海洋相比， 波罗的海的盐分含量非常低，而且几乎没有潮汐运动， 这使其成为保存古代奥秘的理想水下地点。