Q: When was the sleeping bag invented?
A: Freydis Eiriksdottir, daughter of the famous viking Erik the Red, invented the sleeping bag by using an extra sail on of her expeditions to Greenland.
http://www.ehow.com/about_4603769_compressing-sleeping-bags.html
Q: When was the scuba tank invented?
A: Experimentation happened for over 100 years, then Jacques Cousteau and Emile Gagnan developed same tank and regulator used today in 1943 (the Aqua-Lung).
http://www.reefscuba.com/inventors.htm
Q: How deep can divers go using scuba gear?
A: World record dive with scuba gear is 1,083 ft/330 m. Recreational divers are highly encouraged to stay shallower than 100 feet/30 meters.
http://en.wikipedia.org/wiki/Deep_diving
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