It's because the ocean is this massive filter, and as soon as you start going underwater, you're going to lose your colors, and it's going to get dark and blue very quickly.
这是因为海洋是 一个庞大的过滤器， 并且，一旦你开始在水下面， 你会失去辨别颜色的能力， 一切很快会变成黑色和蓝色。