在The ocean was very deep where the ship went down中,从句是修饰the ocean吗?是主语从句还是宾补?

问题描述:

在The ocean was very deep where the ship went down中,从句是修饰the ocean吗?是主语从句还是宾补?

是定语从句
原句可以拆分成这样的两个句子:
The ocean was very deep;
the ship went down in the ocean
因此从句修饰the ocean ,the ocean是先行词
也可以写成
The ocean was very deep in which the ship went down
这里where相当于介词in加连接词which