It depends upon your state law, but 100 feet would be a general answer.
300 feet
about 10 metres/30 feet most of the time but deep sea divers can go to depths of about 30 metres/90 feet
Just because it is easier. It's hard to stand up in fins (FLIPPERS) on a rocking boat!!
A float with a red flag with a diagonal white stripe is the symbol for "Divers Down"; Scuba divers are underwater in this area. Be cautious in the area of the float, because the divers will surface nearby.
I have found an article which you might find interesting. Below 33 feet, there may be a difference in the spectrum of colors which divers can see. Such as the loss of red light.
I have found an article which you might find interesting. Below 33 feet, there may be a difference in the specturm of colours which divers can see. Such as the loss of red light.
Divers have dived over 1,000 feet on scuba (rarely - only four times so far), so that is probably the outer edges of the limit for technical divers.The deepest level you can be 'certified' to dive at is 330 feet/100 meters (TDI Advanced Trimix/IANTD Expedition Trimix). Wrecks like the HMHS Brittanic and the SS Transylvania are dived with some degree of regularity at depths around 450 feet.But there are no scuba police, and many technical divers in fact exceed those depths regularly. The deepest depths to which technical divers are known to dive with any level of regularity are around 550 or so feet (thinking of the Jolanda in the Red Sea at various depths down to and slightly below 550 feet).Dives below 600 feet are extraordinarily rare.
The average aluminum SCUBA cylinder holds 80 cubic feet of air at pressure. That means you are taking the equivalent of a closet's worth of air and smashing it into a cylinder much smaller than that. When full, the cylinder is at 3,000 pounds per square inch of pressure.When the valve is opened, it sends air into the (assumed) first stage regulator which is connected by hoses to gear such as two second stage regulators, instruments and your vest.So the SCUBA tanks don't so much USE the air so much as STORE the air at high pressures.
The flippers help divers move at greater speeds and force and is less taxing on the diver.
A standard-sized SCUBA tank holds 72 cubic feet of air at the standard pressure of 2250 PSI.
Most recreational divers rarely dive below 100 feet. The average depth for a dive is around 60 feet.AdditionThere is a difference between the average deepest depth of of dives in general and the average depth of a single dive. Most dives will have the deepest depth of around 60 feet, but the average depth of that dive will probably be more in the range of 30 feet since divers will start at one depth and usually continue the dive at shallower depths.
Deep diving in the ocean is done very carefully in special suits and helmets. Pressure under the ocean is significant and can be immense by the time you are down a few hundred feet. Scuba diving is sometimes used commercially, but only to depths of about 120 feet. - Many large dockyards and navies employ 'clearance divers ' to repair items on the bottom of ships and work on the dockyard floor. These divers wear heavy canvas suits and large hard helmets, fed air by lines from the surface. They can work down to 300 feet deep or so. Research and oilfield divers can wear special hard suits that allow them to go down almost 1,000 ft. These divers often wear "Newt suits" made by the Canadian company Nuytco Research in Vancouver.