Ocean Sinkholes?



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    Hello! My name is Elspeth and I love this game so much.
    but I started new version of ECO 7.7.2 BETA
    and I played almost 5days and I found some problems.
    Just like picture there are deep sinkholes are appeared around the ocean.
    I guess the cause is my friend made a huge cage in the deep ocean.(but now it's blocked by dirt)
    I really don't know It's just my guess.
    I need help why this happening.