If you turn off the main shut-off valve and the noise stops, there is a leak inside your home. If the hissing noise did not stop when you turned off the valve, the leak is probably outside your home. Outside water leaks can sometimes be detected by a wet spot in the yard or very lush grass in one spot.
The Manned Maneuvering Unit is an astronaut propulsion unit that was used by NASA on three Space Shuttle missions in 1984. The MMU allowed the astronauts to perform untethered EVA spacewalks at a distance from the shuttle. The MMU was used in practice to retrieve a pair of faulty communications satellites, Westar VI and Palapa B2. Following the third mission the unit was retired from use. A smaller successor, the Simplified Aid For EVA Rescue, was first flown in 1994, and is intended for emergen
Accessory Dwelling Unit (ADU) An Accessory Dwelling Unit (ADU) is a room or set of rooms in a single-family home in a single-family zone that has been designed or configured to be used as a separate dwelling unit and has been established by permit. ADUs generally include living, sleeping, kitchen and bathroom facilities and have a lockable entrance door.