Down current + bad visibility + DM disappeared

[bergersau]

Wow that second video is just downright dangerous... That couldn't be real...

And the 5thD videos are some of my favorites for learning skills


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Loose Line is far more dangerous than most people realise.
Here's my favourite "how not to" deploy a DSMB.
Get instruction or a skilled mentor to help whilst you are learning how to use a DSMB if at all possible.

[video=youtube;jPN4PAHJPG4]https://www.youtube.com/watch?v=jPN4PAHJPG4[/video]

 

[Searcaigh]

What a disaster

 

[Neilwood]

I thought the guy was heading to the bottom to get a seat while he untangled the line!

 

[Coop42]

Or oral inflation may cause buoyancy issue when i inhale fully into the smb.

What happens is this.

As long as you're holding the SMB, you, the air in your lungs and the air in the SMB are all parts of the same system.

If you use your exhaled air to fill the SMB there is no buoyancy change. Air in your lungs, or air in the bag, it's all the same.

If you take your regulator out of your mouth and 'shoot' air into the SMB from the regulator, you'll go up (a bit). You've 'added air to the system*'.

Get an instructor to show you, and enjoy!

*that's not technically correct, I know, you carried that air with you in your tank, but it works for this example.

---------- Post added October 23rd, 2015 at 08:59 AM ----------

How is it possible that he doesn't know he's ascending and descending?

Suggestion dude, swim away from the bag, let the line play out, reel in the line, start again!

 

[phoenix31tt]

Free line, imo causes way more problems than they solve... keep your line on a spool or reel.

My method of launching SMB because for me it's the safest and most controlled:

1. Take out the SMB and set it up (i keep mine separate from the spool)
2. Add just a little air to make it workable (upright)
3. Make myself a little negative
4. Blow a full exhaust into it (at this point i'm still negative)
5. Blow another exhaust into it (at this point i'm neutral if slightly positive and the SMB wants to go but i know it wont be filled)
6. Blow one last exhaust into it and release (it's very quick and i go back to being neutral, i don't drop like a stone or rise like a missile)

I've practiced this method close to the bottom to ensure i'm not sinking and also with my buddy watching to make sure i'm not yoyoing...

also please not that the deeper you launch an smb the less air you need to add... if i were @ 60' I would't add 3 breaths, 2 would be enough... but at 30' i need to add 3. A smaller SMB is easier as well... my SMB is 6' because that's what i need in my area, a 4' might be good for you... the 5thD video the guy uses a 3-4'

 

[Storker]

How is it possible that he doesn't know he's ascending and descending?

Mental tunnel vision. He's so absorbed in untangling the bird's nest that he just doesn't have a single bps of bandwidth left to monitor his depth.

It's quite easy to do if to try to bite off more than you can chew.

 

[phoenix31tt]

Mental tunnel vision. He's so absorbed in untangling the bird's nest that he just doesn't have a single bps of bandwidth left to monitor his depth.

It's quite easy to do if to try to bite off more than you can chew.

That happens when doing other even simpler things like clearing a mask or adjusting a camera... It's all about self awareness and proper buoyancy control


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[Neilwood]

What happens is this.

As long as you're holding the SMB, you, the air in your lungs and the air in the SMB are all parts of the same system.

If you use your exhaled air to fill the SMB there is no buoyancy change. Air in your lungs, or air in the bag, it's all the same.

If you take your regulator out of your mouth and 'shoot' air into the SMB from the regulator, you'll go up (a bit). You've 'added air to the system*'.

Get an instructor to show you, and enjoy!

*that's not technically correct, I know, you carried that air with you in your tank, but it works for this example.

---------- Post added October 23rd, 2015 at 08:59 AM ----------

How is it possible that he doesn't know he's ascending and descending?

Suggestion dude, swim away from the bag, let the line play out, reel in the line, start again!

Task loading is a sure way to lose focus on depth, breathing etc especially if the diver is relatively inexperienced and maintaining buoyancy still requires a lot of concious thought.

An experienced diver will give little concious thought to such things as maintaining depth, finning but that takes practise.