@ least 3 feet
2
The QE2 has a draft of 32 ft (9.8 m), so deeperthan that would be best.It would seem QE2 and QM2 might be different ships of the line...
00:04 ~your welcome :/
The area of National Harbor is 4,800,000.0 square meters.
Harbor Porpoises will dive as deep as 656 ft. (200 meters)
minimum height of a habitable room is 2.18 meters and maximum is 4.2 meters.
00:04 ~your welcome :/
The area of Great Egg Harbor River is 2,873,268.0599040003 square meters.
The area of East Harbor State Park is 7,409,794.1094144005 square meters.
The area of Harbor Oaks Residential District is 1,618,742.56896 square meters.
300 Meters
If it is a rectanmgular block, you'll need minimum 40x2 + 12x2 which is 104m minimum