It's a long time tradition to blow the whistles at noontime to let all the folks know it's lunchtime.
This year, a ships horn was on site and it was LOUD.
It's off a super tanker and has a 17" diaphragm.
Here's a video of folks milling about as the whistles blow at lunch. The steam building whistle starts it off and it's joined by the traction engines ( steam tractors) and the ships horn.