Ways to get buddy's attention?

[BlueTrin]

57m on a single tank ?

Checked if it was feet but it was meters

 

[Wibble]

57m on a single tank ?

Bouncy bouncy fun fun fun fun fun, the wonderful thing about Tigger is ... he emulates a free diver in the bounce dive stakes and just loves being off his face on narcosis.

For the rest of us using contemporary kit and techniques it'll be a two plus hour dive with plenty of bottom time and helium mix for the narcosis.

 

[Pressurehead]

https://nswmentor.com/student-downloads/navydivingmanual.pdf

Thanks for that.
I only posted the 'basic' ones we used, so glad I was not required to remember US Navy Diving Manual list of signals.
Well thought out list that it is.

Emergency Signals from the Diver
2-2-2 Pulls “I am fouled and need the assistance of
another diver.”
3-3-3 Pulls “I am fouled but can clear myself.”
4-4-4 Pulls “Haul me up immediately.
'
Don't want to mess with the numbers if it 'hits the fan', was that 4 or 3 Chief?

 

[MrVegas]

Maybe they had big tanks with cave fills.

I think they had the same special everlasting AL80s that the divers in 47 meters down had. Hmm....57 meters on a single AL80 with sharks....maybe there's a movie idea in there somewhere.

 

[aedwards92]

I recently found this video that does a great job in answering my question and addresses many of the concerns others here expressed as well.

 

[John C. Ratliff]

I'm not going to read through all these, but in the days of ol', we had steel tanks, and a knife with a metal cap. We used the metal cap on our steel tanks to bang it and gain attention.

SeaRat

 

[Resqdivemedic]

Yes!
One pull STOP
Two Pulls Give me slack
Three pulls Take up slack
Four pulls Pull me up

How about OATH
1 pull- OK
2 pulls- Advance
3 pulls-Take up slack
4 pulls- Help

Our dive team uses these line signals:
Tender to Diver
1 tug- Are you OK
2 tugs- Stop, change direction
3 tugs- Surface
4 tugs- Stay down

Diver to Tender
1 tug- I am OK
2 tugs- Give me slack
3 tugs- Object found
4+ tugs- HELP!

No matter what line signals used, keep them simple so they are easily remembered.