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BeginnerShore Dive
Mermet Springs
Illinois, United States
Depth15–120 ft (4.6–36.6 m)
AccessShore
Cert LevelOpen Water; wreck/overhead training for 727 penetration; deep/tec training below 60 ft
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Best Time
Spring and fall for best visibility
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Mermet Springs is a spring-fed former rock quarry of about 8.5 acres near Belknap in far southern Illinois, and one of the most famous inland dive sites in the country. Its signature attraction is the Boeing 727 used in the film 'U.S. Marshals,' resting with its tail at 15 feet and nose at 50 feet and open for trained divers to swim through, alongside many other sunken vehicles and training platforms. The quarry reaches about 120 feet deep and is run as a full-service commercial dive park.
Quick Facts
Depth Range4.6m – 36.6m
CertificationOpen Water; wreck/overhead training for 727 penetration; deep/tec training below 60 ft
Gear7mm wetsuit or drysuit below the thermocline, dive light
HazardsDeep dark water below the thermocline, overhead environment inside the 727 fuselage (training required), entanglement on attractions, low visibility after heavy rains
shorewreck
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