The ends of the lanes have touch pads or sensors that respond to contact or pressure from the swimmer. When they hit the wall it stops the timer. Im sure they use other methods too.
1,200 swimmers
1200
themselves.
the koalas from ancient Greece are now swimmers from Africa
42
1200.
on a site
they swim and they swim a lot
nothing
Micheal phelps
8.
No. There were no Olympic games beside the on from Olympia.