Monotone voice. Swim Meet Starting Signal
The sound is the sound taken from the start of an olympic race. This sound acts as a call ("take your mark"} and response (the swimmers diving off the blocks at the 'beep'). This sound is important because of the buildup the start has. It is dead silent, then a monotone voice says "take your mark" and the race is on.
Swimming, diving, Olympics, starts, splash, water
"take your mark" "here we go" "beep"