3 ms·

This is under water. Radio/Cell do not penetrate beyond a few centimeters. Communicating underwater is usually done via acoustics.

paulpauper 3y ago
but the op said "If the mother ship can not find the sub the occupants could be trapped bobbing just below the surface until their air runs out." just beneath the surface
- bob778 3y ago
  In submersible tech, just beneath the surface is 0-30m depth basically (for salt water). Cellphones signals are about 2m max while higher frequencies (eg 2.4GHz) drop off exponentially so are <1m
  - omniglottal 3y ago
    Antennea can trivially extend over 30m, and can float on the surface. As a wire attached to an inflatable float, for either bidirectional communication or as a GPS beacon, or both, the complete solution could exist for less than $10k and less than 10 kilograms to solve this. Why doesn't this exist for this craft that can only be openned from the outside?? There exists the ability to communicate from directly above, so why can't it also communicate (further) through open air while bobbing near the surface?
    - themoonisachees 3y ago
      You seem to be under the impression that the people paying a quarter million dollars to get bolted shut in an experimental sub to go see the titanic are reasonable and people who would think of that. They aren't.
deleted 3y ago
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venusenvy47 3y ago
They have some type of radio link that works at depth for simple texts messages, but they have to be right above it.
- mcpackieh 3y ago
  That doesn't seem right, do you have any source? VLF wouldn't stand a chance of reaching that deep and ELF requires extremely large antenna to work. More likely they were using some form of underwater acoustic communication, sending and receiving data through sound instead of radio waves.
  - venusenvy47 3y ago
    I don't have information about the type of communication link. I shouldn't have called it a radio link. Acoustic probably makes more sense. It was something very slow, so that sounds right.

paulpauper 3y ago

but the op said "If the mother ship can not find the sub the occupants could be trapped bobbing just below the surface until their air runs out." just beneath the surface

bob778 3y ago
In submersible tech, just beneath the surface is 0-30m depth basically (for salt water). Cellphones signals are about 2m max while higher frequencies (eg 2.4GHz) drop off exponentially so are <1m
- omniglottal 3y ago
  Antennea can trivially extend over 30m, and can float on the surface. As a wire attached to an inflatable float, for either bidirectional communication or as a GPS beacon, or both, the complete solution could exist for less than $10k and less than 10 kilograms to solve this. Why doesn't this exist for this craft that can only be openned from the outside?? There exists the ability to communicate from directly above, so why can't it also communicate (further) through open air while bobbing near the surface?
  - themoonisachees 3y ago
    You seem to be under the impression that the people paying a quarter million dollars to get bolted shut in an experimental sub to go see the titanic are reasonable and people who would think of that. They aren't.

deleted 3y ago

[deleted]

venusenvy47 3y ago

They have some type of radio link that works at depth for simple texts messages, but they have to be right above it.

mcpackieh 3y ago
That doesn't seem right, do you have any source? VLF wouldn't stand a chance of reaching that deep and ELF requires extremely large antenna to work. More likely they were using some form of underwater acoustic communication, sending and receiving data through sound instead of radio waves.
- venusenvy47 3y ago
  I don't have information about the type of communication link. I shouldn't have called it a radio link. Acoustic probably makes more sense. It was something very slow, so that sounds right.