There are a few ways to secure a floating dock in deep water. One way is to use anchors. Another way is to use moorings. Anchors can be used to hold the dock in place, while moorings can be used to keep the dock from drifting away. Anchors can be made of concrete, steel, or other materials. They can be either dropped overboard or set into the seabed. Moorings usually consist of a metal chain or cable that is attached to the dock and then anchored underwater.

For a floating dock in deep water, you need to secure it to the sea bed. This can be done by using anchors or moorings. The anchors will keep the dock in place, while the moorings will stop it from drifting away.