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2. Portable water tank - Wikipedia

   en.wikipedia.org/wiki/Portable_water_tank

   A portable water tank is a temporary collapsible tank designed for the reserve storage of water in firefighting, emergency relief, and military applications. These tanks can be either supported or unsupported. The supported tanks have a steel or aluminum frame and range in size from 600 to 5,000 US gallons (500 to 4,160 imp gal; 2,300 to 18,900 ...

3. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.

4. Fresh water - Wikipedia

   en.wikipedia.org/wiki/Fresh_water

   Fresh water is the water resource that is of the most and immediate use to humans. Fresh water is not always potable water, that is, water safe to drink by humans. Much of the earth's fresh water (on the surface and groundwater) is to a substantial degree unsuitable for human consumption without treatment.

5. Timeline of diving technology - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_diving_technology

   The timeline of underwater diving technology is a chronological list of notable events in the history of the development of underwater diving equipment.With the partial exception of breath-hold diving, the development of underwater diving capacity, scope, and popularity, has been closely linked to available technology, and the physiological constraints of the underwater environment.

6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

7. List of diving hazards and precautions - Wikipedia

   en.wikipedia.org/wiki/List_of_diving_hazards_and...

   Found worldwide in tropical seas and fresh water. Consult local information on risk. Stay out of waters and surroundings known to be inhabited by crocodiles. Titan triggerfish: This tropical Indo-Pacific fish is very territorial during breeding season and will attack and bite divers. [50] Keep a lookout for the fish and move away if they act ...