6 ms·

If you read the article, you know that the context was extremely specific and not suitable for general use. The noise is too big problem. In ”normal” context s

by nicce 3y ago

If you read the article, you know that the context was extremely specific and not suitable for general use. The noise is too big problem. In ”normal” context such signal is not currently known to be really possible. You know that submarines are not equipped with these. The ship on the surface had to drop cable 100 meters below the ship to combat noise. Which means that for communication to be possible, ship cannot really move. And the ship is supposed to be almost directly above the submarine, to reduce the noise again. For signal to be practical, it should go either over the surface or go long distances horizontally and be usable even with some noise.

krisoft 3y ago
> If you read the article Rest assure that I have read the article i have linked. > the context was extremely specific and not suitable for general use What does general use mean? The context is the same. We are talking about an expeditionary submersible having constant and reliable communication with its support ship all the way to the bottom. This was the setup of Cameron’s dive and this was the setup of the ill-faited Titan mission. Are you claiming that this is not possible?
- 111111IIIIIII 3y ago
  This is HN. People here will defend "lean startups" to the grave, as long as it's not their own grave.
- nicce 3y ago
  > We are talking about an expeditionary submersible having constant and reliable communication with its support ship all the way to the bottom. The lost submarine in this context had no similar support ship. It made connection to base on being on the surface from long distance. ”General” would mean that either submarine is capable for keeping long distance communications regardless if is is diving or on the surface. Either to any closeby ships or even the ground station. And for that there is no reliable technology yet.
  - krisoft 3y ago
    > The lost submarine in this context had no similar support ship. Sorry. Are we talking about the same case? I'm talking about the Titan submersible which were lost on 18 June 2023, five days ago as of this writing. It absolutely had a support ship. The MV Polar Prince. Here is a picture of it towing the submersible out from port a few days before its disappearance: https://i.cbc.ca/1.6885535.1687464250!/fileImage/httpImage/image.jpg_gen/derivatives/original_1180/titan-submersible-and-polar-prince.jpg https://i.cbc.ca/1.6885535.1687464250!/fileImage/httpImage/i... The people lost lived on the support ship, and only boarded the submersible when they arrived right above the Titanic. There the crew from the support ship bolted the crew of the submersible in, and the support ship remained in position and in communication with them until they lost that link. Then they waited for a long time, and only when the submersible was overdue that is when they raised the alarm. The only reason why we did know that the submersible went missing is because those on the support ship raised the alarm. > And for that there is no reliable technology yet. You can say that, but you are wrong. Sound waves propagate very well. I think what you might be confused about is that military submarines do not communicate with the shore during operations. They remain silent because if they start to transmit everyone will know where they are. But that is not because there is no reliable technology for it. In fact they can just blast a loud sound wave out with their active sonar and everyone all around the ocean will hear them who cares to listen. I'm not saying that it is easy. All I'm saying that it is perfectly within our capabilities if we want to.
worrycue 3y ago
I think for 3-4km it’s practical to run a wire from the surface all the way to the submersible - that’s what they do for torpedos and anti-tank TOW missiles.
- nickserv 3y ago
  If the sub is exploring a wreck the wire could easily get snagged.

by nicce 3y ago

krisoft 3y ago

> If you read the article Rest assure that I have read the article i have linked. > the context was extremely specific and not suitable for general use What does general use mean? The context is the same. We are talking about an expeditionary submersible having constant and reliable communication with its support ship all the way to the bottom. This was the setup of Cameron’s dive and this was the setup of the ill-faited Titan mission. Are you claiming that this is not possible?

111111IIIIIII 3y ago
This is HN. People here will defend "lean startups" to the grave, as long as it's not their own grave.
nicce 3y ago
> We are talking about an expeditionary submersible having constant and reliable communication with its support ship all the way to the bottom. The lost submarine in this context had no similar support ship. It made connection to base on being on the surface from long distance. ”General” would mean that either submarine is capable for keeping long distance communications regardless if is is diving or on the surface. Either to any closeby ships or even the ground station. And for that there is no reliable technology yet.
- krisoft 3y ago
  > The lost submarine in this context had no similar support ship. Sorry. Are we talking about the same case? I'm talking about the Titan submersible which were lost on 18 June 2023, five days ago as of this writing. It absolutely had a support ship. The MV Polar Prince. Here is a picture of it towing the submersible out from port a few days before its disappearance: https://i.cbc.ca/1.6885535.1687464250!/fileImage/httpImage/image.jpg_gen/derivatives/original_1180/titan-submersible-and-polar-prince.jpg https://i.cbc.ca/1.6885535.1687464250!/fileImage/httpImage/i... The people lost lived on the support ship, and only boarded the submersible when they arrived right above the Titanic. There the crew from the support ship bolted the crew of the submersible in, and the support ship remained in position and in communication with them until they lost that link. Then they waited for a long time, and only when the submersible was overdue that is when they raised the alarm. The only reason why we did know that the submersible went missing is because those on the support ship raised the alarm. > And for that there is no reliable technology yet. You can say that, but you are wrong. Sound waves propagate very well. I think what you might be confused about is that military submarines do not communicate with the shore during operations. They remain silent because if they start to transmit everyone will know where they are. But that is not because there is no reliable technology for it. In fact they can just blast a loud sound wave out with their active sonar and everyone all around the ocean will hear them who cares to listen. I'm not saying that it is easy. All I'm saying that it is perfectly within our capabilities if we want to.

worrycue 3y ago

I think for 3-4km it’s practical to run a wire from the surface all the way to the submersible - that’s what they do for torpedos and anti-tank TOW missiles.

nickserv 3y ago
If the sub is exploring a wreck the wire could easily get snagged.