I wonder what the monkey’s fists are for?

Besides that, it looks like much of the carbon fiber tube collapsed into the titanium hatch-door thing.

Thanks. For sharing. That’s a very lonely place to be when something goes wrong.

quote:

Originally posted by Fly-Sig:
That water was moving at very high speed. Someone posted it was supersonic. In any case it was moving fast, which means it had tremendous momentum which takes tremendous force to stop. It would compress the air to a higher pressure than the static water pressure of 5000 psi. Think of that high speed column of water as a piston slamming into the air at the far end of the tube.

The speed of sound in water would be much faster than in air, which we commonly think about. From Wikipedia:

The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. In colloquial speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance: typically, sound travels most slowly in gases, faster in liquids, and fastest in solids. For example, while sound travels at 343 m/s in air, it travels at 1,481 m/s in water (almost 4.3 times as fast) and at 5,120 m/s in iron (almost 15 times as fast). In an exceptionally stiff material such as diamond, sound travels at 12,000 m/s (39,000 ft/s) – about 35 times its speed in air and about the fastest it can travel under normal conditions.

quote:

Originally posted by trapper189:
I wonder what the monkey’s fists are for?

Bopping sharks on the nose?

Handles

^Yes...

quote:

So, most ROV's have a manipulator, or an arm which can be used to grab things and move things around. The monkey's fist makes it easier to grab onto, as well as indicating what needs to be grabbed. Also, if the thing you're working with falls to the bottom, the fist will float, making it easier to spot and get hold of.

Thanks for the update.

Old thread warning!

On 2/7/2025, the Coast Guard released the audio of the implosion heard by a NOAA bouy 900 miles away:



"A National Oceanic and Atmospheric Administration (NOAA) moored passive acoustic recorder, approximately 900 miles from the Titan submersible implosion site, records the suspected acoustic signature of the Titan submersible implosion, June 18, 2023. The U.S. Coast Guard’s Titan Marine Board of Investigation (MBI) released the audio as part of the investigation and as an investigation exhibit. The recording was provided to the MBI by NOAA, which approved its use in the investigation and public release. (Audio courtesy of the Coast Guard Titan Marine Board of Investigation)"
Link

(Old joke warning!)




"Well, the front fell in."

Well, there are … regulations governing the materials they can be made of

What materials?

Well, Cardboard’s out

And?

No cardboard derivatives

Like paper?

No paper, no string, no carbon fiber

quote:

Originally posted by trapper189:


On 2/7/2025, the Coast Guard released the audio of the implosion heard by a NOAA bouy 900 miles away:

900 miles away. that's remarkable.

Sound underwater travels at approximately 1500 meters per second, so to travel 900 miles (which is roughly 1,448,000 meters), it would take around 965 seconds (or about 16 minutes).

Calculation:
900 miles = 1,448,000 meters [conversion]
Speed of sound underwater = 1500 meters/second
Time = Distance / Speed = 1,448,000 meters / 1500 meters/second = 965 seconds

^^^ I thought the water would have enough damping effect such that the signal to noise ratio would be next to nothing at 900 miles. That's the part that amazes me, that it can even be heard so far away.

Noise and water are a pretty incredible combination.

Forty years ago I had a room mate in California,
He was retired from the navy.

His last job involved listening to noises in the ocean on the California coast.


This was way pre computer tools.

They listened to 80 recordings of. . . . Stuff.

In order to identify motors, natural sounds and sort out anomaly stuff.


Computers ( he said) increased their abilities to identify, ten fold in a years time.

Way back then most of there abilities were classified.

Because of how sound travels, in general the denser the medium the better it propagates through that medium. Water is denser than air, so sounds can be heard farther in the ocean.

quote:

For example, while sound travels at 343 m/s in air, it travels at 1481 m/s in water (almost 4.3 times as fast) and at 5120 m/s in iron (almost 15 times as fast). In an exceptionally stiff material such as diamond, sound travels at 12,000 m/s (39,370 ft/s) – about 35 times its speed in air and about the fastest it can travel under normal conditions.

Link

quote:

Originally posted by bendable:

...Forty years ago I had a room mate in California, He was retired from the navy.

His last job involved listening to noises in the ocean on the California coast...

66 Years of Undersea Surveillance

By Captain Brian Taddiken, U.S. Navy and Lieutenant Kirsten Krock, U.S. Navy

February 2021 Naval History Volume 35, Number 1

Just over 66 years ago, one of the Navy’s most secretive communities began. Its members went by the code word SOSUS, which means “Sound Surveillance System.” A new front line in the Cold War, they had one mission: FIND SUBMARINES.

Lack of knowledge and information concerning oceanographic and acoustic conditions off the continental coasts hampered the U.S. Navy’s efforts against the submarine threat during World War II. It was apparent the German Navy had better information and a better understanding of how to use the Atlantic Ocean. Consequently, since the war, the U.S. Navy has maintained a continuous program of oceanographic surveys designed to provide more detailed information on currents, temperature, salinity, and other factors that comprise the oceanic environment and affect the transmission of sound in saltwater. The U.S. Navy was determined never to again lag behind others in its knowledge of this vital battlespace.

In early 1950, on the recommendation of the Committee on Undersea Warfare to the Assistant Chief of Naval Operations, Project Jezebel was born—a long-range program dedicated to the detection, classification, and localization of enemy submarines...

Complete article:

https://www.usni.org/magazines...ndersea-surveillance