how did John Cameron "tweet" from the bottom of the Marianas Trench?

Breathing helium?

Cheers

Phil Hobbs

I'm not sure, but there's lots of information and a video on the sub here:

ObElectronics: There's a Tek DSO that shows up in the video several times...

The mix down there may or may not be a Helium mix. ISTR that it is not, once a certain depth is passed.

I do know he has a long wait in a HBC before he can emerge topside again.

Thanks for the link. Nice details of the redundancy of the weight drop system.

Cheers

Why would that be???

So he can decompress slowly (purge the blood of Nitrogen)?

Why decompress????

From the dashboard pix at the linked page, the internal pressure is ~1bar.

With 1100bar external pressure, any internal pressure tolerable to a human would be inconsequential from a structural point of view.

yes? no?

Though "timed galvanic decay" sounds like a scary thing to rely on.

Well, the diving vessel itself can double as the HBC in this case. I'm sure it does.

Good to know that you're sure...

Most likely an acoustic telemetry system. You can send voice or data over these systems.

You quote well, but you ain't real bright, boy. "tweet" implies "connected", not "relayed".

Your quote does NOT answer the question.

AND, on top of that stating he "tweeted from the bottom" means to me that his machine ON THE BOTTOM had Internet hooks. Otherwise it was sent by someone else.

Your quoting (apparently unread), however, shows us that he very likely proxies his message up to the surface, and it then gets sent from a machine logged into his account from there.

"Texting to the surface..." is NOT "Tweeting from the depths..."

Are you able to see the difference?

The way I would do it is to have a machine on the bottom, a full duplex communications tether and a machine on the surface being controlled by the machine on the bottom through that tether. THEN, he could send a tweet in real time without assistance.

AND the craft on the surface has to have a KVH mobile sat connection too.

You used no logic. You mouthed a petty little wussy boy remark.

So, you ARE that petty little wussy boy. It isn't a name or a name call, it is a DIRECT DESCRIPTION, you stupid f*ck. Learn the difference.

To the SURFACE SHIP, NOT to the Internet.

Try to get a clue,and actually READ the question the TITLE of the post asks.

To tweet from below REQUIRES a LIVE connection. I doubt SERIOUSLY that he had one, and doubt further that a slow method would work at all.

Sorry, but XON and XOFF ain't gonna cut it. He would need tcpip. Period.

I'd say yes, as a guess.

async serial is plenty, just run a text-mode browser (eg: elinks) on the ship and a terminal program in the sub.

You still don't get it. Text comms to the surface via a serial connection is one thing. Being online LIVE on a tweeter page is an entirely different animal.

Get a clue.

Un bel giorno Archimedes' Lever digitò:

Parsing plain text coming from the acoustic telemetry serial line, and sending it via TCP/IP to the Twitter site, is something that every kid can do in ten minutes with an Arduino. Maybe twenty minutes, if you also want to receive tweets.

It's nice the information I gave, helped you figure it out. BTW, the real Archimede's Lever is very knowledgeable and socially able. Why did you steal such a unique name? Mikek