Can any divers answer this?
When Bond finds Melina clearing the undersea ruins, they swim up to the boat but before they go, she removes her scuba gear and leaves her oxygen tank on the seabed.
Later in the film after they have been dragged over the coral, they use this air tank to survive underwater until Krystatos' boat has gone.
My question is this: is there any reason why she would remove her (presumably quite expensive) oxygen tank and leave it at the bottom of the ocean? Or is it just a plot device that they came up with so they could survive after the coral-dragging? There was no way that she would know that at some later point she would find herself stuck underwater like that.
Seems like a bit of lazy writing in an otherwise good Bond film, but I am not an experienced diver so didin't know if there was a legitimate reason for her doing this.
Thanks
"I don't know, I'm making this up as I go."