Rather than spotting the boat...

[MapisM]

...can anyone spot what these unidentified diving objects are?
Hint: the pic was taken from the sea bottom, looking at the surface.

 

[mitchc]

I know, please sir please, I know

Never seen any that thin, but that's a great photo...where was it taken?

 

[epervier]

Aquatic hoola hoops

 

[mlines]

Are the Mysterons about to appear?

 

[Norwegian]

hmmm must be air "bubbels"/rings.. i have seen on telly that Delfins make them and play with them Delfins spin them around..

take a look on this on youtube http://www.youtube.com/watch?v=bCsK_Zbb_6o

 

[epervier]

A first for me, Bottle nose Dolphins blowing air rings, absolutely fascinating, lots more on you tube.

 

[PaulGooch]

Are the Mysterons about to appear?

Is the one on the left Captain Scarlet ?

 

[MapisM]

must be air "bubbels"/rings

Give that man a virtual cigar! Not made by dolphins, though.
It's actually easy to make them, for anyone familiar with smoke rings.
In fact, the technique is exactly the same - it's the water pressure which gives almost automatically such regular shape, whilst smoke rings aren't that thin and tend to dissolve, because they quickly mix with the air.
Of course, it takes also a bit of confidence with scuba diving, because the regulator must be taken out, putting it back in mouth afterwards, hopefully without drinking in between...

Oh, and in reply to Mitch: that's the southern coast of Fernando de Noronha. Crystal clear water, innit? The pic was taken while standing on the bottom at 70 feet or so, and the rings were just beginning their climb to the surface above us, go figure!