.. Sunken bridges

The yellow button will raise the bridges in the directions where the dog statues point.

First, create, with the black bridges, a way to the other control unit.

You need to click the middle button so that the nearest black dog points right. Click the right button so that the right dog points the other.

Turn the white ones so that they form a way all the way back

Finally, turn the black dogs so that they complete the way.