Could you shed some light on why that is used here, please?
Es fantástico que ellos estén a salvo.
Estar a salvo is a set expression in Spanish meaning "to be safe [out of danger]". It is always using the preposition "a". We also use "ponerse a salvo", meaning "to get to safety", for example:
"Los residentes de la zona se pusieron a salvo del incendio, huyendo en sus coches."
"The residents of the area got to safety from the fire, by escaping in their cars."
I hope it helps,
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