Can you sink by blowing up your BC below 40m?

[Boyan]

Today I heard an interesting thing from a very experienced diver:

When you put air into your BC and you are at 40m you start to sink because of negative bubbles. If you are a lot below 40m, adding air in your BC does nothing, hence there is no fast ascend like that from beyond 40m.

Is this the case? wth are "negative bubbles"?

 

[Patoux01]

Someone got trolled...

 

[atmerritt]

I think someone was having some fun with you. Nothing at 40m changes how bouyancy works. Now, some things do get weird the deeper you go, but the concepts of buoyancy and BC function stay the same. Never heard the term "negative bubbles" in my life. Can you elaborate on how he explained it? Sounds interesting

 

[Wookie]

Nice. When you're down there, grab me about 100 feet of water line and a bucket of steam, would ya?

 

[Norwegian Cave Diver]

Don't ever trust that guy again. Sounds like he is trying to screw with your mind. If he thinks it's funny then he is an a hole.

 

[divad]

Nice. When you're down there, grab me about 100 feet of water line and a bucket of steam, would ya?

They have steam down there?

 

[joe10540]

They have steam down there?

Sure they do! It's the instant variety just heat it up and your ready to serve!

 

[Wookie]

They have steam down there?

It's Ikea steam.

 

[Sevenrider860]

Bendimedes Principal

Any object, wholly or partially immersed in a stationary fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object...unless that object is below 40 meters and the fluid is displaced by air at which point the force vector is reversed and the object is no longer buoyed by any forces. Commonly referred to as "negative bubbles".

This phenomenon was discovered by Archimedes younger brother Bendimedes while he was researching early Greek halucigenics.

 

[Wookie]

Bendimedes Principal

Any object, wholly or partially immersed in a stationary fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object...unless that object is below 40 meters and the fluid is displaced by air at which point the force vector is reversed and the object is no longer buoyed by any forces. Commonly referred to as "negative bubbles".

This phenomenon was discovered by Archimedes younger brother Bendimedes while he was researching early Greek halucigenics.

You've never seen a vessel establish positive buoyancy after being subjected to negative bubbles, have you?