All pilots have to do is follow
the beams down to 200 feet above the ground, at which point they must be able to
see the runway and its approach lights. If not, by federal law, they must climb
back up into the soup and decide whether they want to try another approach or
go to an alternate airport.
A plane can land by itself using
a system that is often referred to as “autoland”. The pilots can program the
auto pilot to carry out the landing automatically whilst the pilots monitor the
aircraft.
a plane lands on water, cabin
air valves which are underwater can be closed by the pilot with a switch in the
cockpit, otherwise, they would let in water. The plane would stay afloat long
enough for all the passengers to exit the aircraft via the inflated slides.