AAUS STATISTICS COLLECTION CRITERIA AND DEFINITIONS
"Dive Time in Minutes", "Number of Dives Logged", and "Number of Divers Logging Dives" will be collected for the categories below except Depth Ranges, for which only the latter two metrics are collected.
Dive Time in Minutes is defined as the surface to surface time including any safety or required decompression stops.
A Dive is defined as a descent into water, an underwater diving activity utilizing compressed gas, an ascent/return to the surface, and a surface interval of greater than ten minutes.
Dives will not be differentiated as openwater or confined water dives but both openwater and confined water dives will be logged and classified as either scientific or training/proficiency.
A "Diver Logging a Dive" is a person diving under the auspices of your scientific diving organization. Dives logged by divers from another AAUS Organization will be reported from the divers home organization. Divers who have not actually logged a dive during the reporting period are not counted under this category.
Incident(s) occurring during the collection cycle. Only incidents occurring during, or resulting from, a dive where the diver is breathing a compressed gas should be submitted to AAUS.
Scientific Dives: Dives that meet the scientific diving exemption as defined in 29 CFR 1910.402. Diving tasks traditionally associated with a specific scientific discipline are considered a scientific dive. Construction and trouble-shooting tasks traditionally associated with commercial diving are not considered a scientific dive.
Training and Proficiency Dives: Dives performed as part of a scientific diver training program, or dives performed in maintenance of a scientific diving certification/authorization.
Air: Dives where the bottom gas used for the dive is air.
Nitrox: Dives where the bottom gas used for the dive is a combination of
nitrogen and oxygen other than air.
Mixed Gas: Dives where the bottom gas used for the dive is a combination of
oxygen, nitrogen, and helium (or other "exotic" gas), or any other breathing gas
combination not classified as air or nitrox.
Open Circuit Scuba: Dives where the breathing gas is inhaled from a self contained underwater breathing apparatus and all of the exhaled gas leaves the breathing loop.
Surface Supplied: Dives where the breathing gas is supplied from the surface by means of a pressurized umbilical hose. The umbilical generally consists of a gas supply hose, strength member, pneumofathometer hose, and communication line. The umbilical supplies a helmet or full-face mask. The diver may rely on the tender at the surface to keep up with the divers' depth, time and diving profile.
Hookah: While similar to Surface Supplied in that the breathing gas is supplied from the surface by means of a pressurized hose, the supply hose does not require a strength member, pneumofathometer hose, or communication line. Hookah equipment may be as simple as a long hose attached to a standard scuba cylinder supplying a standard scuba second stage. The diver is responsible for the monitoring his/her own depth, time, and diving profile.
Rebreathers: Dives where the breathing gas is repeatedly recycled in the breathing loop. The breathing loop may be fully closed or semi-closed. Note: A rebreather dive ending in an open circuit bailout is still logged as a rebreather dive.
Decompression Planning and Calculation Method:
PC Based Decompression Software
Required Decompression: Any dive where the diver exceeds the no-decompression
limit of the decompression planning method being employed.
Overhead Environments: Any dive where the diver does not have direct access
to the surface due to a physical obstruction.
Blue Water Diving: Openwater diving where the bottom is generally > 200
feet deep and requiring the use of multiple-tethered diving techniques.
Ice and Polar Diving: Any dive conducted under ice or in polar conditions.
Note: An Ice Dive would also be classified as an Overhead Environment dive.
Saturation Diving: Excursion dives conducted as part of a saturation mission
are to be logged by "classification", "mode", "gas", etc. The "surface" for
these excursions is defined as leaving and surfacing within the Habitat. Time
spent within the Habitat or chamber shall not be logged by AAUS.
Aquarium: A specialized environment designed for the housing, and/or
exhibition of fish, etc. Not a swimming pool.
Depth ranges for sorting logged dives are 0-30, 31-60, 61-100, 101-130,
131-150, 151-190, and 191->. Depths are in feet seawater. A dive is logged to
the maximum depth reached during the dive. Note: Only "The Number of Dives
Logged" and "The Number of Divers Logging Dives" will be collected for this
Hyperbaric: Decompression Sickness, AGE, or other barotrauma requiring
Barotrauma: Barotrauma requiring medical attention from a physician or
medical facility, but not requiring recompression therapy.
Injury: Any non-barotrauma injury accruing during a dive that requires
medical attention from a physician or medical facility.
Illness: Any illness requiring medical attention that can be attributed to
Near Drowning/Hypoxia: An incident where a person asphyxiates to the minimum
point of unconsciousness during a dive involving a compressed gas. But the
Hyperoxic/Oxygen Toxicity: An incident that can be attributed to the diver
being exposed to too high a partial pressure of oxygen.
Hypercapnea: An incident that can be attributed to the diver being exposed to
an excess of carbon dioxide.
Fatality:Any death accruing during a dive or resulting from the diving exposure.
Other: An incident that does not fit one of the listed incident types
Incident Rating Scale:
Minor: Injuries that the OM considers being minor in nature. Examples of this
classification of incident would include, but not be limited to: Mask squeeze
that produced discoloration of the eyes. Lacerations requiring medical attention
but not involving moderate or severe bleeding. Other injuries that would not be
expected to produce long term adverse effects on the diver's health or diving
Moderate: Injuries that the OM considers being moderate in nature. Examples
of this classification would include, but not be limited to: DCS symptoms that
resolved with the administration of oxygen, hyperbaric treatment given as a
precaution. DCS symptoms resolved with the first hyperbaric treatment. Broken
bones. Torn ligaments or cartilage. Concussion. Ear barotrauma requiring
Serious: Injuries that the OM considers being serious in nature. Examples of
this classification would include, but not be limited to: Arterial Gas Embolism.
DCS symptoms requiring multiple hyperbaric treatment. Near drowning. Oxygen
Toxicity. Hypercapnea. Spinal injuries. Heart attack.