According to the wikipedia page(Astacus astacus), “Astacus astacus is restricted to fresh water, living only in unpolluted streams, rivers and lakes”. So deep sea is a place where the crayfish cannot live.
But somehow He traveled all the way across the world. He is a sort of astronaut.
This is the scene only the explorer was able to see. He had never seen such eternal depth. If he can speak, he may have said, “The sea is blue”.
Kakino-tane is dropping instead of salmon caviar
A scene with no dropping and less volume scatter.
The European crayfish object is b2przemo’s Astacus.