User:Loujingyuand/sandbox

Article Evaluation and improving.

Article title: Technical diving

Link: technical diving

Sign of a bad quality articles Improvement:
 * Occurance of unsourced opinions.
 * agency classification of ice diving, and rebreather diving at the chart
 * Extremely limited visibility
 * Deep air/ Extend range diving.
 * Unnamed groups of people
 * "Some" Training agencies diving specialties and standards classification.
 * "Some cases" at hazards and risk sections.
 * Links are not working.
 * Biased source from single training agency.

1.Delete information that is biased and not supported by a valid reference

2.Correct Unnamed groups of people by adding the actual name of the group.

3.Adding new reference to the page.

After improving Difference between recreational and technical diving

Situations of inability to directly ascent.
Technical divers often involve situations of inability to ascent to surface directly due to a mandatory decompression stop or a physical ceiling. This form of diving implies a much larger reliance on redundancy of critical equipment and procedural training since the diver must stay underwater until it is safe to ascend or the diver has successfully exited the overhead environment.

Delete Extremely Limited Visibility Section because of lack of reliable reference support.

Deep air/extended range diving
One of the more divisive subjects in technical diving concerns using compressed air as a breathing gas on dives below 130 ft. Some training agencies still promote and teach courses using air up to depths of 60m. These include TDI, IANTD and DSAT/PADI. Others, including NAUI Tec, GUE,ISE and UTD consider that diving deeper than 100 –, depending upon agency, on air is unacceptably risky. They promote the use of mixtures containing helium to limit the apparent narcotic depth to their agency specified limit should be used for dives beyond a certain limit. Even though TDI and IANTD teach courses using air up to depths of 60m, they also offer courses include "helitrox" "recreational trimix" and "advance recreational trimix" that also use mixtures containing helium to mitigate narcotic concerns when the diving depth is limited to 30-45m.

The Divers Alert Network does not endorse or reject deep air diving, but indicates the additional risks involved.