Two fire engines were sent to the scene shortly before midday.
A woman was taken to Aberdeen Royal Infirmary after the incident on Monday.
Unite members are escalating industrial action in a dispute over pay, jobs and conditions.
Business Improvement District manager Derek Ritchie has hailed the proposals, which will create a 10 jobs and upskill hundreds right on the doorstep of the Garioch town.
Allen Martin, 69, had claimed he had a "prostate issue" and had pulled down his trousers in what his solicitor called an "almighty risk that backfired spectacularly".
The new spa facilities at Douneside House are due to open in mid-April 2027.
Several coastguard crews assisted the police-led search in the early hours of Tuesday morning.
An ambulance responded to the incident on Auchinyell Road.
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