Douglas lifeboat was called out at the weekend after a mysterious distress signal.
The volunteer crew was called out shortly before 11.35pm on Saturday to try and locate the flares - approximately five miles east of Douglas.
Despite an intense search of more than four and a half hours, with added assistance from a rescue helicopter they were unable to locate the source.
The lifeboat and helicopter stood down at 3.55am and returned back to station.
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Trainee police constables raise £1,400 with kayak challenge
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RNLI honours the 40 years of service between two volunteers
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Passport and immigration public counters to temporarily close
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Overnight delay means today's sailings will set off late
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Fireworks displays to kick off with event tonight
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