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While a trip to a Disney Resort should be a great time for all, hearing this three-whistle code could massively dampen the atmosphere for the rest of the day.
Disney prides itself on having the most magical theme parks in the world, but even with that said, there comes a time when you still have to deal with real-life situations.
While the cast members do their very best to stay in character and delight children and adult fans alike, they are also trained on how to deal with the realities of serious incidents.
There are a lot of codes for a variety of park-related issues like accidents, illnesses and vomit (yuck). But there's also quite an extensive system in place for the swimming pools at a Disney Resort hotel.
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So, how does it work?
Well, according to a report by the Exploreist, each whistle has a meaning that each lifeguard and cast member understands.

Single whistle
This apparently means that a lifeguard is preparing to dive into the pool and is likely about to assist a guest with an issue.
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At this moment, other lifeguards will immediately activate their emergency action plan.
This essentially means there will be someone to cover the area where the lifeguard previously was, ultimately ensuring that all areas of the pool remain monitored until they return to their position.
Two whistles
This signal can be a little less ominous and is said to simply mean that an announcement is coming.
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At the end of each day, a lifeguard will blow their whistle twice, meaning that the time in the pool is over and that other lifeguards should start ushering people out of the area.
However, the signal could also mean that the pool is about to be closed due to a safety issue like potential lightning, or other health issues in the pool like vomit or urination or... well, you know.

Either way, lifeguards and cast members know that when two whistles are blown an announcement is coming.
Three whistles
This signal is considerably rarer due to the fact that it's not needed all that much but is certainly one of the most important.
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According to The Exploreist, this calls for lifeguards and cast members to jump right into action as a guest is either seriously injured, has fallen seriously ill or requires immediate medical attention.
Staff must then stop what they are doing and move to the area to assist in any way possible until emergency services are on the scene.
LADbible Group has contacted Disney for comment.