When you have a dolphin in a block of water with air above it, when a player nearby is in creative, survival, or adventure mode, the dolphin will grab air every now and then.
However, if everyone in the local area is in spectator mode, it does not go to get air and then it eventually dies.
You can check this by putting a dolphin into the block of water and waiting in creative mode using the "/data get entity [Dolphin's uuid] Air" command and you will see it replenishes.
Then go into spectator mode and do the same command and you will see it will only go downwards until it dies.
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I stayed in spectator mode for the 4 minutes of air they have when under water and it died from asphyxiation. However, if I wait 3 minutes in spectator mode then go into creative mode it will almost immediately go up for air.
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