actual bottom time (ABT) A term used in common dive tables to represent the amount of time a diver spent underwater. This time begins upon descent and ends upon the beginning of the ascent.

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## How long after diving Can you fly?

The Divers Alert Network (DAN) recommends a 12-hour minimum surface interval before flying, and the Professional Association of Diving Instructors’ (PADI) Flying After Diving guidelines say divers should not ascend to a high altitude within 12 hours of completing a single dive or 18 hours after doing multiple dives (

## What is a repetitive dive?

A repetitive dive is a dive, which takes place between 10 minutes and 12 hours after your last dive took place. If you have been at the surface for more than 12 hours, then the decompression is completed and you can dive again without any danger.

## What is ppo2 Max?

PPO2 is the maximum partial pressure of oxygen we want to have during the dive. FO2 is the percentage of oxygen in the mix.

1 hour

## Is scuba diving dangerous at 30 feet?

The 30-foot-per-minute rate may not always be practical for the whole ascent, especially when you are deep and low on air or approaching hypothermia. In that case a faster rate, up to 60 feet per minute, is acceptable, but for the final 60 feet of your ascent, you should slow to 30 feet per minute.

## What does the bends feel like?

The pain associated with the bends usually feels like a dull ache, but can be much more severe, like a stabbing sensation. This painful sensation can also occur in other parts of the body, including the ear, the spinal cord, the lungs, the brain or the skin.

## How do you calculate maximum operating depth?

Formula. The formula simply divides the absolute partial pressure of oxygen which can be tolerated (expressed in atmospheres or bar) by the fraction of oxygen in the breathing gas, to calculate the absolute pressure at which the mix can be breathed.

## What is the minimum surface interval required between a dive to 18 Metres 60 feet for 40 minutes?

First dive: 18 metres/60 feet for 15 minutes; surface interval: 1:00. Second dive: 12 metres/40 feet for 30 minutes. Describe the three required situations in which a safety stop should be made.

## Accordingly, what does bottom time mean?

bottom time. Time used in calculating decompression obligation from decompression tables. For most tables this is defined as the elapsed time from starting the descent to starting the final ascent to the surface, excluding ascent and decompression time.

## How many days in a row can you dive?

Divers on liveaboard trips routinely do four or five dives daily for multiple days in a row, often 26-27 dives in 5 1/2 days.

## How long can you dive at 60 feet?

Here’s one example from the PADI dive table: You dive to a depth of 60 feet and stay down for 37 minutes. This puts you in pressure group O. After a surface interval of an hour, you have off-gassed enough nitrogen to move you up to pressure group E.

## Furthermore, how long is a decompression stop?

While a safety stop is always carried out at 15-20 feet for 3 to 5 minutes a decompression stop varies based on the depth and time the diver spent at a particular depth, and that diver would perform a Deco Stop and a Safety Stop at 5m (15ft).

## Can you get the bends at 40 feet?

Diver Develops DCS After Getting Lost

After a 40-minute wreck dive to 78 feet (24 meters) and one hour surface interval, a group of divers made a second dive to 78 feet (24 meters) for about 45 minutes.

## What is a diver called?

Underwater diving, also called underwater swimming, swimming done underwater either with a minimum of equipment, as in skin diving (free diving), or with a scuba (abbreviation of self-contained underwater-breathing apparatus) or an Aqua-Lung.

## How long should my surface interval be?

Surface Interval Time (SIT) must be at least 10 minutes between dives. If your SIT is less than 10 minutes, you must consider your second dive as a continuation of the first dive. NAUI recommends a SIT of at least one hour between dives.

## What is residual nitrogen?

The term residual nitrogen designates the nitrogen which can still be released into your body tissue even many hours after a dive. The procedure is also known as decompression. As a rule, this residual nitrogen is not dangerous and needs up to 24 hours before it is completely dissolved.

## What is the maximum recommended depth for using 100 percent oxygen?

The maximum recommended depth for using 100 percent oxygen is 6 m/20 ft. 29. 12. The term EAN32 refers to a Nitrox mixture in which the Fraction of Oxygen is 32 percent.

## Hereof, how long can I dive at 30 feet?

For shallow dives between 6-10 metres (20-30 feet) you could spend many hours without needing to stop for decompression. But if you dive deeper than 30 metres (100 feet), your time at this depth is limited to around 20 minutes before a decompression stop is required.

## What is GTR in diving?

Section 7.2 ————–GTR Mode Gas Time Remaining (GTR) is the time in minutes that can be spent at the current depth and SAC rate until a DIRECT ascent to the surface at a rate of 33 feet/min (10 m/min) would result in surfacing with the reserve pressure.

## How many dives can you do in a day?

PADI standards say that we can do no more than 3 training dives in a day, so that answer is very clear. So how can you do your Open Water and Advanced Open Water in a long weekend or your Advanced Open Water and Rescue in a long weekend? The key word is long as in 3 day weekend.