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2. Doing It Right (scuba diving) - Wikipedia

   en.wikipedia.org/wiki/Doing_It_Right_(scuba_diving)

   Communication is central to buddy and team diving. DIR divers must be competent at underwater communication by hand signals and light signals, and to use them to ensure that they are always aware of the status of the rest of the team. DIR divers have an extended range of hand signals, some particularly relevant to overhead and decompression diving.

3. List of diving equipment manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_diving_equipment...

   SUEX – Diver propulsion vehicles, underwater navigation systems. [133] Suunto – Finnish manufacturer of compasses, dive computers and sports watches – Dive computers, compasses; Swindell (diving helmet), also known as Advanced Diving Equipment Company – Free-flow open circuit air helmets. [134] The helmet was invented by George Swindell

4. Divers Alert Network - Wikipedia

   en.wikipedia.org/wiki/Divers_Alert_Network

   Divers Alert Network (DAN) is a group of not-for-profit organizations dedicated to improving diving safety for all divers. It was founded in Durham, North Carolina, United States, in 1980 at Duke University providing 24/7 telephonic hot-line diving medical assistance.

5. Free Shipping Day - Wikipedia

   en.wikipedia.org/wiki/Free_Shipping_Day

   Online shoppers spent $942 million to make Free Shipping Day the third highest spending day of the 2010 holiday season, [3] ultimately boosting online sales 61 percent from 2009. [4] In 2011, Free Shipping Day became a billion-dollar shopping holiday with $1.072 billion in sales, [ 5 ] followed by $1.01 billion during Free Shipping Day 2012.

6. List of diving environments by type - Wikipedia

   en.wikipedia.org/wiki/List_of_diving...

   The recommended depth limit for more extensively trained recreational divers ranges from 30 metres (98 ft) for PADI divers, [19] (this is the depth at which nitrogen narcosis symptoms generally begin to be noticeable in adults), to 40 metres (130 ft) specified by Recreational Scuba Training Council, [19] 50 metres (160 ft) for divers of the ...

7. Divers Institute of Technology - Wikipedia

   en.wikipedia.org/wiki/Divers_Institute_of_Technology

   Divers Institute of Technology Logo. Divers Institute of Technology (DIT) is a private, for-profit educational institution for the training of commercial divers and located in Seattle, Washington. Founded in 1968 in Seattle, Washington, Divers Institute of Technology is located on the North end of Lake Union near Gas Works Park in the ...