*dead -- "Video unavailable
This video is no longer available due to a copyright claim by Sonar Entertainment"

@CrushBug

Related story: during the later years of the war, when Allied air and sea supremacy made the Bay of Biscay a deathtrap, Allied torpedo boats took up ambush positions at the entrances to U-Boot bases, particularly La Rochelle. They'd get into position at night and stay just outside of range of the coastal defence batteries. Before outgoing submarines could reach deep water, they'd be plastered with hand grenades by these speed boats.

It wouldn't be able to sink a sub, but a lucky hit might damage the periscope and it did reduce the sub's sonar abilities by massive amounts, covering the entire exit area in a blanket of noise. Not to mention the psychological effect...

Anyway, just small bits of history.

Now, about this video: that small chance to be hit by a grenade chunk is surpassed by the rather noticable chance to be hit by one of roughly 6500 steel balls within a run-of-the-mill frag grenade used over here. Doesn't make the underwater experience any better though...

@Payback -- that helps with the "how", thanks.

A big part of my confusion was/is from how it started the hop *before* it got close to the object. Without driver input that would require sensors aiming ahead (some mix of cameras, sonar, laser range, etc.) that I can see being a part of a car built around such a system from the ground up, but would go beyond the scope of a drop-in "suspension replacement".

But I can see a reactive suspension system working like that -- it has a computer control unit that normally just responds to sensors in the suspension (reactive rather than predictive), but has a button that can manually initiate that maneuver just like you described. In that way I guess it isn't that much different from a Tesla Model S "insane mode"; driver initiates it and the computer (and car) does the rest.

Interesting.

*promote the sonar!

*related=http://videosift.com/video/Flash-Sonar-Echolocation-Technique-For-The-Blind

Daniel Kish: How I use sonar to navigate the world has been added as a related post - related requested by Zawash on that post.

Flash Sonar - Echolocation Technique For The Blind has been added as a related post - related requested by Zawash.

You are partially correct, I listed the rank of a top submarine officer incorrectly, but not his position, I'm not in the Navy. He was Executive Officer of the first nuclear sub, but only First Lieutenant of the diesel. EDIT: He "qualified for command" of the nuclear sub...probably why I thought "commander" but properly should have said "was in command". Shortly after being assigned to lead the nuclear sub trials, after helping design and build it, he led the American shut down of the Chalk River reactor, lest you continue to insinuate he was an 'armchair warrior' that never held command.
(record below)

◾17? DEC 1948 - 01 FEB 1951 -- Duty aboard USS Pomfret (SS-391) Billets Held: Communications Officer, Electronics Officer, Sonar Officer, Gunnery Officer, First Lieutenant, Electrical Officer, Supply Officer Qualifications: 4 Feb 1950 Qualified in Submarine


◾05 JUNE 1949 -- Promoted to Lieutenant (j.g.)


◾01 FEB 1951 - 10 NOV 1951 -- Duty with Shipbuilding and Naval Inspector of Ordnance, Groton, CT as prospective Engineering Officer of the USS K-1 during precommissioning fitting out of the submarine.


◾10 NOV 1951 - 16 OCT 1952 -- Duty aboard USS K-1(SSK-1) Billets Held: Executive Officer, Engineering Officer, Operations Officer, Gunnery Officer, Electronics Repair Officer Qualifications: Qualified for Command of Submarine Remarks: Submarine was new construction, first vessel of its class


◾01 JUNE 1952 -- Promoted to Lieutenant


◾16 OCT 1952 - 08 OCT 1953 -- Duty with US Atomic Energy Commission (Division of Reactor Development, Schenectady Operations Office) From 3 NOV 1952 to 1 MAR 1953 he served on temporary duty with Naval Reactors Branch, US Atomic Energy Commission, Washington, D.C. "assisting in the design and development of nuclear propulsion plants for naval vessels." From 1 MAR 1953 to 8 OCT 1953 he was under instruction to become an engineering officer for a nuclear power plant. He also assisted in setting up on-the-job training for the enlisted men being instructed in nuclear propulsion for the USS Seawolf (SSN575).


On December 12, 1952, an accident with the experimental NRX reactor at Atomic Energy of Canada's Chalk River Laboratories caused a partial meltdown. The resulting explosion caused millions of liters of radioactive water to flood the reactor building's basement, and the reactor's core was no longer usable.[7] Carter was ordered to Chalk River, joining other American and Canadian service personnel. He was the officer in charge of the U.S. team assisting in the shutdown of the Chalk River Nuclear Reactor.[8] The painstaking process required each team member, including Carter, to don protective gear, and be lowered individually into the reactor to disassemble it for minutes at a time. During and after his presidency, Carter indicated that his experience at Chalk River shaped his views on nuclear power and nuclear weapons, including his decision not to pursue completion of the neutron bomb.[9]

I was thinking the same thing; for dolphins, which live in an acoustic, not visual world, I wonder if all the coloration and stuff even makes a difference; I mean, to the dolphin's sonar, unless it's been very careful matched, fiberglass/plastic can't be bouncing the same as a flesh and shell---or can they?
Still, cool. Because dolphins, the jesters of the deep...

*quality

They can immediately tell it's not real through use of their sonar, which gives them an ultrasound-like picture of the insides of it.

I imagine that's why they find it so fascinating. Had they thought it the real deal, they wouldn't be paying any special attention to it. If the goal of the program was to document natural behavior, it's died aborning.

If he built some mechanism to hold the bubbles, and make the tail fin pedal-powered, this would be a great stealth vehicle. So small that sonar would think it's just a shark or dolphin.

Con, sonar! Crazy Ivan!

What causes this?

http://bubbleheads.blogspot.com/2005/03/more-sonar-causes-sea-mammal-beaching.html

Perhaps because they live underwater and we don't. Plenty of animals have abilities that we do not. An eagle can see for miles around them. A shark can regenerate its teeth. Bats have sonar which helps them navigate in the dark. What separates us is that we are made in Gods image. Meaning, we are imbued with certain attributes which resemble Gods divine nature. For instance, man, like God, has an intelligence, a mind. We each have a personality as God does. We are creative beings, and use language. We are also moral beings. The initial perfection was a spiritual perfection, but since the fall we have been corrupted by sin. When we turn from our sins and repent, we are new creatures, and transformed into the image of Christ. This is how we are reconciled back to God, and how we attain again to the initial perfection of creation.