Why can't I dive twice on the same tank?

[Tigerbeach]

So I'm fuming about the fact that someone is suggesting that I have to carry all that air to literally be an air-wetnurse for a bunch of potential idiots.

So tell us how you really feel about this; don't be shy and hold back...

[littleleemur]

So tell us how you really feel about this; don't be shy and hold back...

I'm sure what I'd like to *really* say would be censored

I never deny air to anyone or yell at them later for coming to me underwater; I'm just glad that I was there when they needed it and so avoided the unthinkable. Just the attitude that annoys me. Plus the additional comments on how they saved $ on air b/c they could always use mine! Once or twice is funny, more & it gets old. In that light, it seems fair that fills should be charged on what you need.

& the Charter operator isn't always the one who does the fills. I'm happy to tip the Charter guys

[Papa Bear]

First, you are talking about diving in a overhead environment! You should always have a topped off tank and should never dive a tank smaller than your buddy! In Cave Diving that can get both of you killed! When you are in an overhead situation you have to think of your buddy team as one unit. You have to carry enough air to get both of you to safety! It is the rule of thirds! And you are going in a third down to start! If your Caribbean diving in open water I could care less! But if your doing a 63cft in wreck dives you won't be my buddy or I wouldn't let you in the water on my boat! Take a wreck course or a cave course! You can't make more are at 80ft! For Some people a 63cft is a bailout bottle! you can always dive a bigger tank than your buddy but never smaller!

[lars2923]

First, you are talking about diving in a overhead environment! You should always have a topped off tank and should never dive a tank smaller than your buddy! In Cave Diving that can get both of you killed! When you are in an overhead situation you have to think of your buddy team as one unit. You have to carry enough air to get both of you to safety! It is the rule of thirds! And you are going in a third down to start! If your Caribbean diving in open water I could care less! But if your doing a 63cft in wreck dives you won't be my buddy or I wouldn't let you in the water on my boat! Take a wreck course or a cave course! You can't make more are at 80ft! For Some people a 63cft is a bailout bottle! you can always dive a bigger tank than your buddy but never smaller!

Well, if you dive with a bigger tank than your buddy, than your buddy is diving a smaller tank then their buddy, and you never dive on a smaller tank than your buddy... lol... Just messin with ya...

[Papa Bear]

I am only talking about overhead environments on days that end in "Y"! Otherwise go for it!

[seasnake]

Wow ... that is a LOT of exclamation points!!!

First, you are talking about diving in a overhead environment! You should always have a topped off tank and should never dive a tank smaller than your buddy! In Cave Diving that can get both of you killed! When you are in an overhead situation you have to think of your buddy team as one unit. You have to carry enough air to get both of you to safety! It is the rule of thirds! And you are going in a third down to start! If your Caribbean diving in open water I could care less! But if your doing a 63cft in wreck dives you won't be my buddy or I wouldn't let you in the water on my boat! Take a wreck course or a cave course! You can't make more are at 80ft! For Some people a 63cft is a bailout bottle! you can always dive a bigger tank than your buddy but never smaller!

[Papa Bear]

I think of them as passion points!!!! And I am very passionate about my diving

[scuba smurf]

First, you are talking about diving in a overhead environment! You should always have a topped off tank and should never dive a tank smaller than your buddy! In Cave Diving that can get both of you killed! When you are in an overhead situation you have to think of your buddy team as one unit. You have to carry enough air to get both of you to safety! It is the rule of thirds! And you are going in a third down to start! If your Caribbean diving in open water I could care less! But if your doing a 63cft in wreck dives you won't be my buddy or I wouldn't let you in the water on my boat! Take a wreck course or a cave course! You can't make more are at 80ft! For Some people a 63cft is a bailout bottle! you can always dive a bigger tank than your buddy but never smaller!

I definitley agree with getting the proper training portion of your post papa. However, in a perfect world everyone would be diving the same tanks, this isn't the case however. When planning ANY dive turn pressures/volumes should be calculated based on the person with the smallest amount of breathing gas and/or the highest sac rate.
I'm not a cave diver..........yet, but I have heard of cave divers re-calculating 3'rds/6'ths and heading back in for a little jaunt in the cave so I'd say these folks are heading in with a less than full gas supply. For any overhead diving, the team should be configured the same with redundant gas supplies, proper training.

[Papa Bear]

If I am in A OH environment with a diver with a 63 and their sac rate is great and they get into trouble we have no problem, unless I screw up, but if have a problem and have to put my life and theirs on whats left in their tank we have a big problem. It happen in Caving where the team is H & W or B & G and one sets up with twin 72s or 80s and the the hog sets up with 105s or 120s! The trouble is on the horizon, what happens if you just before turn around and the hog has a major problem with the air supply? Is 2/3rds of a set of 72s enough to get both of you out? Maybe, and I am not putting my life on the line for a maybe! Never go in an Overhead environment unless planned and with the amount of air you planned on! So its not about her or her sac rate, its about the dive, and where your going and what your doing!

[scuba smurf]

from the sounds of it maybe some proper overead/dive planning training would be in order for you