Bounce dive or not a bounce dive?

[jaysonorvis]

I’m personally certified for decompression diving and have logged hundreds of deco dives. Still, I gotta ask: is what we’re commonly doing a “bounce dive” and does it carry risk of bubble cross-over through the lung?

Typical no. Dives: 3-4
Typical surface interval: 1 hour +
Rig: Single 80cu tank + full reserve in separate “pony” tank (24-40cu.)
Duration: approx 8 mins bottom time
Algorithm: Galileo Luna set to L2
Ascent: slow. Includes PDIS mid-water stop + middle conservancy setting, always with at least 5@10min deco + 3 min safety stop per the computer.

Many thanks.

 

[The Chairman]

No, it's not a bounce dive. A bounce dive is usually a minute or so. You don't really have to worry about bubble pumping if you've been 15 minutes or more out of the water.

 

[northernone]

I’m personally certified for decompression diving and have logged hundreds of deco dives. Still, I gotta ask: is what we’re commonly doing a “bounce dive” and does it carry risk of bubble cross-over through the lung?

Typical no. Dives: 3-4
Typical surface interval: 1 hour +
Rig: Single 80cu tank + full reserve in separate “pony” tank (24-40cu.)
Duration: approx 8 mins bottom time
Algorithm: Galileo Luna set to L2
Ascent: slow. Includes PDIS mid-water stop + middle conservancy setting, always with at least 5@10min deco + 3 min safety stop per the computer.

Many thanks.

I go with two classifications: saturation and bounce. We're generally bounce divers.

 

[kensuf]

We're bounce divers. Ask anyone that spends massive time in a lockout chamber, we do simple little bimbles.

 

[100days-a-year]

As few of us are commercial sat divers,we classify a bounce as a dive significantly shorter than NDL.

 

[Celt]

When we would say “someone needs to do a bounce” it would mean someone needs to get down and see what work needs to be done and get back as quickly as possible.

 

[keyshunter]

In the bad old days, the Key West wrecks did not have mooring balls. They had mooring lines attached which were released after the dive. When the boat arrived, the dm was dropped to find the line and send the end up on a lift bag. This was considered a "bounce" if the dm followed the bag up, or a "dive" if he stayed down to lead the dive. I did many of each.

 

[Fires]

Interesting concept. I have also always wondered what it would be classified as. But I guess it depends through which persons eyes you are looking. I would (from sat view) also say we only do bounce dives. But then from rec view, say a bounce dive is 1-2 mins, i.e. you are literally tagging the depth you are after without much planning. Where as a tech dive with deco, would generally be more than 2 min bottom time, and it would all be planned out a lot more.

 

[Blasto]

If you don't reach saturation, it's bounce diving.

Since 100% of rec and tec diving is bounce, the term in tec is sometimes used to emphasize dives that go beyond the norm of bounce diving, and approach freediving with their near-zero bottom time.

8 minute bottom time is a short dive, but it's not that. The "bounce" bounce diving style you appear to be concerned about usually refers to extremely fast descents to minimize on-gas and an immediate ascent. In such dives, standard deco algorithms have been known to fail. A dive with 8 minute BT will not fall into that category.