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The distance from the surface of the water to the lowest point of the boat: How much depth of water does the boat need not to touch the bottom.
Eleven kilometers is the maximum depth of the Pacific Ocean.
The Bentley Subglacial Trench, which reaches a depth of 2,555 meters below sea level is the lowest point in Antarctica. It is also the lowest place on earth not covered by ocean but by ice.
The Luray Caverns have a depth of approximately 120 feet (37 meters) from the entrance to the lowest point.
The continent with the lowest point is Antarctica. The Bentley Subglacial Trench is the lowest point on the continent, reaching a depth of about 8,377 feet (2,553 meters) below sea level.
the lowest depth of the lechuguilla cave is 1,600
Light from the red end of the spectrum penetrates deep water better than light from the blue end of the spectrum. Evidence: Algae that live in deeper water have chlorophylls with absorbance peaks in the infra-red part of the spectrum.
The lowest point on Earth's crust is at the bottom of the Mariana Trench, where the Pacific Plate is subducting under the Mariana microplate. It has a maximum depth of slightly over 36,000 feet below sea level.
The draft of a yacht or any other vessel is the depth from the waterline to the lowest point of the keel. Naturally it varies with the vessel being considered.
It is the boat's draft.
30 meters up
The vernier adjustment is numbered. Go to the lowest point in the object you can focus on. Note your vernier setting. Adjust to the highest point you can focus on. Subtract the lower number from the higher and you get depth.