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What is a Squeeze?

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What is Visibility?

What is a Active Addition Semi-Closed Circuit Rebreather Systems?

What is a Depth Gauge?

What is Activated Carbon in Scuba Diving?

What is a diving wetsuit?

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What is Rapture of the Deep?

What is Open Water Diving?

What is a Rip Current?

What is the Professional Association of Diving Instructors (PADI)?

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What is an Overhead Environment when diving?

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What is a Primary Light?

What is a Safety Stop during Scuba Diving?

What is a Rebreather?

What is a Dive Light?

What is the Divers Alert Network (DAN)?

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What are Booties?

What is an LED Dive Light?

What is Oxygen?

What is Exposure Protection when Scuba Diving, Freediving, or Snorkeling?

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What is a Drop Weight?

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What is “Out of Air”?

What is Mask Clearing?

What is an Over Pressure Valve?

What is a Dive Flag?

What is a Long Hose used for in Scuba Diving?

What is a Snorkel?

What is Open Water Certification?

What is Scuba Schools International (SSI)?

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What is an Inflator Valve?

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What is a Backward Roll Entry when Scuba Diving?

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What is Heliox?

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What is Outgassing?

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What is a Dive Watch?

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What is a A-Clamp Valve?

What is carbon dioxide toxicity (CO2 toxicity) from scuba diving?

What is Pressure?

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What is a Quad Cylinder System?

What is a Lost Buddy Drill?

What is a J Cylinder?

What is Cyanosis?

What is the Primary Second Stage?

What is a Purge?

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What is No Mount Diving?

What is a Faceplate?

What is a Lift Bag?