i don't know what made anybody think the dolphins were going to just stay in the same place. they gotta eat.

why is everybody saying it is dolphins? Why cant it just be one rogue dolphin acting on its own?

Think you need more than one dolphin for it to be a conspiracy.

because that would be stupid.

Cool, interesting read.

We need more heroes like this!

http://www.telegraph.co.uk/news/worl...handshake.html

Watching the clip, it looked like they putting on a show for the folks back home. It's just not serious.

It wasn't literally a soup can attached to a pole. It's a handheld hydrophone. The sounds they picked up probably weren't the BB but because the sounds where picked up in a "high priority zone" they can't be totally discounted.

Excellent illustration from Washington Post showing how far down the boxes are thought to be.

Holy crap that's deep!

Yeh cool picture. I think some people fail to realise that it's pitch black down there.

You'd have to pay me A LOT of money to go 15k feet under water in that little submarine. I get the heebie jeebies just thinking about it.

Are you saying that the oceans are bigger than we've been led to believe?

Certainly deeper. But we know where the Titanic is and the plane seems to be just downhill from that. This shouldn't be too difficult.

I like how the media keeps comparing this to the titanic and how long it took to discover it as if thats some big meaningful point. I'm pretty sure they would have found the Titanic a lot faster if they started with the technology we have today.

Still took two years for that air france flight in 2009

http://intellihub.com/freelance-jour...-diego-garcia/

Sent from my ADR6300 using 2+2 Forums

Damn, that's amazing. I've regained a little hope for mankind.

And?

I've spent a significant portion of my career developing sonar and other acoustic equipment for oceanographic use. While this guy's comments are true in general he's mostly full of crap (the guy who gave the above quote, not the poster. Although the poster could be full of crap too, I have no way of verifying that). The effects he's talking about really only apply in shallow water (less than a couple thousand feet) where there's a significant thermal gradient (salinity has only a minor effect on sound propagation and pressure increases linearly with depth, no great mystery there). In deep water like we're looking at here the path that sound travels is pretty easy to predict. Stuff on the seafloor near the transmitter can cause reflections and reverberation but you won't even notice those effects by the time the pulse reaches the surface.

I believe I read that the sites of the 2 detections were several miles apart. Attenuation of a propagating sound wave increases rapidly as frequency increases. Whale calls are able to travel great distances because they're low frequency (in addition to being aided by thermoclines and other oddities of the ocean). A 37kHz pulse (I think that's what the recorders are transmitting) isn't going to travel for many miles. Especially when they're using a towed surface receiver to listen for the ping. That's a relatively noisy environment to be listening for a faint ping. If you hear it, it will be pretty close to you.

So I have to conclude that one of the detected pings was either coming from a different source or was just a false detection. That happens a lot, especially if you're really really hoping to hear something.

Well yea it's in deep water but wouldn't it have to travel through the shallow stuff that can cause all those problems at some point to get to the detectors on the surface?

^^ this is why I love 2p2, no matter what the subject, you're never far from an actual expert opinion. Just a shame you got to put up with the hilarious alien/dolphin/satellites-don't-exist crap too.

Fwiw I thought the two detection sites were reported as actually being something like 600km apart?

Spot on, yes: 600km apart.

I know everything is relative, but normally to me shallow means something I can wade in.

From what you've said then, it's surely completely impossible that the two detections could be the same thing?