open/close

Website Options

Options below affect the visual display. Choices are stored using browser cookies.

  • The low bandwidth option causes most images to disappear and stops external fonts from loading.

  • The underlined links option causes all website links to become underlined, making them easier to distinguish.

  • The high contrast option causes colors to change to mostly black and white.

Utility Navigation

Controlled Ascent

2015
Oct 21

Video Display Options

  • YouTube
  • HTML5
  • Why choose?
close

The current state of video display on the web provides many challenges. If this website contains a YouTube video, we default to it since it is more likely to work in your choice of device/browser. That may not provide the experience you prefer, so we offer the option to choose your display: YouTube or HTML5. Please note the HTML5 video option may not work at all in some browsers/devices. If you cannot view the video you can download it from our video repository.

Transcript Content

WEBVTT

00:00:05.000 --> 00:00:07.000
[underwater exhalation]

00:00:11.566 --> 00:00:15.366
Your bottom time ends when you start to make a
direct ascent to the surface.

00:00:15.366 --> 00:00:23.066
It's important that you're able to control your
ascent because dive tables are based on an
ascent rate of no faster than 30 feet per minute.

00:00:23.066 --> 00:00:26.266
There are a few things you need to adjust in
order to moderate your ascent.

00:00:26.266 --> 00:00:29.432
For example, the air inside your BC starts to
expand.

00:00:29.433 --> 00:00:33.633
Also gas trapped in your exposure protection
will expand and increase your ascent rate.

00:00:33.900 --> 00:00:39.066
You need to stay with your dive buddies and
everyone in the group should ascend at the
same rate.

00:00:40.900 --> 00:00:44.500
Before you make a controlled ascent there are a
few things you need to do.

00:00:44.500 --> 00:00:48.100
Check with your dive buddies and make sure
they are ready to leave bottom.

00:00:48.100 --> 00:00:53.166
check your cylinder pressure and then check
your dive time so you know when your dive ends.

00:00:53.166 --> 00:00:56.632
Hand positions are very important during a
controlled ascent.

00:00:56.633 --> 00:01:01.599
All divers should always have their right hand
with a closed fist above their head.

00:01:01.600 --> 00:01:03.700
The closed fist protects your fingers.

00:01:04.200 --> 00:01:07.600
The fist above your head protects your head
from overhead obstructions.

00:01:08.666 --> 00:01:12.932
All divers always look above themselves and
their dive buddies for overhead obstructions

00:01:12.933 --> 00:01:16.033
and we can only ascend as fast as the slowest
diver in the buddy team.

00:01:30.833 --> 00:01:37.666
When the divers get to the surface, the first thing
they do is inflate their BCs so that they're
positively buoyant.

Closed Caption File

Topics

Operation

Topics

Audience tags

Share

  • Facebook
  • Twitter
  • LinkedIn
  • Twitter

The information provided using this web site is only intended to be general summary information to the public. It is not intended to take the place of either written law or regulations.

Neither NOAA, the OMAO, the individuals featured in the videos, nor any other party associated with the production of these videos accept responsibility for any accident or injury resulting from the use of materials contained herein.

Information in these videos is current as of the date of production. Although we try to keep this information up-to-date and accurate, neither NOAA, the OMAO, nor any agency, officer, or employee thereof warrants the accuracy, completeness, or usefulness of any information, products, or processes disclosed herein, and shall not be held responsible for any losses caused by reliance on the accuracy, reliability or timeliness of such information. Portions of such information may be incorrect or out of date. Any person or entity that relies on any information obtained from the instructional videos herein does so at his or her own risk.

The views and opinions of authors expressed on OMAO websites do not necessarily state or reflect those of the U.S. Government, and they may not be used for advertising or product endorsement purposes.

OMAO makes every effort to provide virus-free files but does not guarantee uncorrupted files.

You are here: https://www.omao.noaa.gov/find/media/video/controlled-ascent
Reviewed: June 20, 2016. Contact us with page issues.

*ac
"Access controlled" content.
top