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Snell's window (also called Snell's circle [1] or optical man-hole [2]) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. [3] This phenomenon is caused by refraction of light entering water, and is governed by Snell's Law. [4]
A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]
AAE-1 – Asia Africa Europe Gateway; France, Italy, Greece, Egypt, Saudi Arabia, Djibouti, Yemen, Qatar, UAE, Oman, Pakistan, India, Myanmar, Cambodia, Thailand ...
A diving chamber is a vessel for human occupation, which may have an entrance that can be sealed to hold an internal pressure significantly higher than ambient pressure, a pressurised gas system to control the internal pressure, and a supply of breathing gas for the occupants.
Having a small internal orinasal mask inside the main mask, which separates the external respiratory passage from the rest of the mask interior. In a few models of full face mask a mouthpiece like those used on diving regulators is fitted, which has the same function as an oro-nasal mask, but can further reduce the volume of the external dead ...
A silt out or silt-out is a situation when underwater visibility is rapidly reduced to functional zero by disturbing fine particulate deposits on the bottom or other solid surfaces. This can happen in scuba and surface supplied diving , or in ROV and submersible operations, and is a more serious hazard for scuba diving in penetration situations ...
NASA Extreme Environment Mission Operations, or NEEMO, [1] is a NASA analog mission that sends groups of astronauts, engineers and scientists to live in the Aquarius underwater laboratory, the world's only undersea research station, for up to three weeks at a time in preparation for future space exploration.
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 December 2024. Large baleen whale species Humpback whale Temporal range: 7.2–0 Ma Pre๊ ๊ O S D C P T J K Pg N Late Miocene – Recent Size compared to an average human Conservation status Least Concern (IUCN 3.1) CITES Appendix I (CITES) Scientific classification Domain: Eukaryota Kingdom ...