# Speed of sound in H2O

**URL:** <https://boards.straightdope.com/t/speed-of-sound-in-h2o/27871>\
**Category:** Factual Questions\
**Created:** [August 2, 2000, 5:22pm UTC](https://boards.straightdope.com/t/speed-of-sound-in-h2o/27871 "2000-08-02T17:22:59Z")\
**Posts on this page:** 2\
**Page:** 2

<div class="post-metadata">

**Author:** ![pluto](https://avatars.discourse-cdn.com/v4/letter/p/f08c70/32.png) [@pluto](https://boards.straightdope.com/u/pluto)\
**Post date:** [August 3, 2000, 4:18pm UTC](https://boards.straightdope.com/t/speed-of-sound-in-h2o/27871/21 "2000-08-03T16:18:03Z")

</div>

Interesting article, and it seems to answer a lot of issues that were raised here. I was pleased to note that the Navy describes their supersonic bullets, designed to penetrate 12 meters of water as having to “penetrate a steel wall”.

---

<div class="post-metadata">

**Author:** ![Whack-a-Mole](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/whack-a-mole/32/141_2.png) [@Whack-a-Mole](https://boards.straightdope.com/u/Whack-a-Mole)\
**Post date:** [August 3, 2000, 4:25pm UTC](https://boards.straightdope.com/t/speed-of-sound-in-h2o/27871/22 "2000-08-03T16:25:42Z")

</div>

Interesting article…definitely weird science. I don’t think I would have believed it if I hadn’t read it (and we all know that if it’s written it MUST be true 😉 ). Still, I’ll buy the concept for now although I doubt I’ll be on an underwater supersonic transatlantic ‘flight’ in my lifetime.

Check out the link I provided above for a real picture of a supercavity. This one drags behind the foil instead of enclosing it as the supersonic subramine one is supposed to but still interesting.

[Previous page](https://boards.straightdope.com/t/speed-of-sound-in-h2o/27871.md?page=1)