Yes,
The breathing pattern that freedivers use is benefical for asthma, it reduces the exacerbations.
The problem is with the depht, even shallow dephts.
In a 10 meters CB dive, the atmospheric pressure change is twice (1 at sea level and 2 at 10 mts), so this also dangerous for asthmatics (moderate to severe) because some air can get trapped in the ascent and cause a barotrauma.
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