Save the dog from a 70m deep, 35cm wide hole

helicopter + dude on a rope

It reminds me of The Crow and the Pitcher from Aesop's Fables: https://en.wikipedia.org/wiki/The_Crow_and_the_Pitcher

Without knowing the total parameters of what is possible and not possible, perhaps they could slowly lower buckets of dirt and rocks to the bottom in a way where the dog could just remain standing on the top of the pile.

wire cage just below the diameter of the home, 3 to 4 feet tall so dog can stand up in it, large cable to hoist it attached at the top, install a canvas cinch sack, with grommets in the bottom, completely open on bottom when lowering, run a smaller rope through the grommets, with the grommets low to the ground on the cage.

Also need a light and webcam or remote cam.

Hang dog treats on top of the cage.

Then Lower the cage with the large cable till it's flush on the ground, watch on camera for dog climbing up for treats.

Then pull small cable to cinch the bag under him.

Hope they get the little guy out.

How is the dog getting sufficient oxygen...?

Fill the hole with water on a pipe that's lowered to the bottom (so the dog does not get a shower for hours).

1. Long cable with a pinhole camera to "see" 2. Another long metal cable with a "loop" at the end to grab the dog. 3. Aneasthetic gas to temporarily put the dog into slumber so that the extraction is not stressful.

Send a cable with a camera along with an "extractor" (which can grab the dog by its body.)

Slowly fill the hole with very salty water. The dog will float to the surface.

The stated dimensions will require about 7000 gallons of water. This is the capacity of a large-ish tank truck. 70+ meter hoses should be readily available.

1. Dig a parallel hole adjacent to the existing one (w/ a large diameter). 2. Then lower a person to the level of the dog (this person should have oxygen support). 3. Person then connects two holes by demolishing thin layer between these two holes. 4. Person rescues dog

1. Bore a second (longer) hole at an angle 45° above the ground to meet at the existing hole at the end. The dog walks out.

    ------------------------ ground
    |                  ⧸
    |               ⧸
    |            ⧸
    |         ⧸
    |      ⧸
    |   ⧸
    |⧸

In the meantime, lower a long hose with a GoPro on the end into the hole to provide a stream of water and examine if the dog is hurt.

2. Ask the fire department for ideas?

Some ideas from a Reddit thread about getting a small object out of a deep hole [1]:

3. "Could a hose with vacuum pressure grab it?"

4. "Right now, we are thinking about making our own 20' version of the "grabeasy". Basically a long pole with bent wires coming out the end which will grab like a claw when you draw them in."

And from a pets.stackexchange thread about getting a cat out of a hole [2]:

5. "The safest interactive way for everyone is to use a live trap, and lower it down for the cat to go in and be lifted out."

[1]: https://www.reddit.com/r/needadvice/comments/2x94fh/how_do_i...

[2]: http://pets.stackexchange.com/questions/8171/a-kitty-fell-do...

make a 28cm-wide cylindrical cage with a trap door in the bottom and camera / light. lower over dog. trap door opens as bottom of cage goes over dog's head. keep lowering until cage is on bottom of hole. raise cage.

it may pinch the dog's leg but at least it wouldn't be dead.

Take a 140+ m rope, fold in half such that there's a loop. Affix a sizeable weight near the loop such that it is stationary on one side of the rope and the other side moves freely through the weight. Lower the loop down such that it is positioned, open, at the dog's level (like a snare). Wait for the dog to walk through the loop such that front paws are on one side and back paws on the other (obviously need a camera down there). Raise and tighten the loop (by pulling the length of rope that is free moving through the weight) such that the rope closes snugly around the dog (i.e. over its back and under its front legs; NOT around it's neck obviously). Raise.

Edit: diagram: http://imgur.com/a/W8PZ6

Rope ladder perhaps?

Drop an inflatable tube into the hole. Try to maneuver the deflated tube under the dog. Inflate the tube and pull the dog up, using the tube as the "floor of the elevator" (so to speak). You could drop one of those auto-inflating life vests into the hole on a string, get it under the dog, then pull another string to inflate the jacket, then pull up the dog on the life jacket. I'm pretty sure you could get a vest large enough that it would block the hole!

Robotic clamp on a rope. Grab dog by the scruff of his neck and hoist.

Reminds me of Baby Jessica

https://en.m.wikipedia.org/wiki/Jessica_McClure

Jessica McClure Morales (born March 26, 1986) became famous at the age of 18 months after she fell into a well in her mom's backyard in Midland, Texas on October 14, 1987. Between that day and October 16, rescuers worked around-the-clock for 58 consecutive hours to free her from the eight-inch (20 cm) well casing 22 feet (6.7 m) below the ground. The story gained worldwide attention (leading to some criticism as a media circus), and later became the subject of a 1989 ABC television movie Everybody's Baby: The Rescue of Jessica McClure. As presented in the film, the relatively new technology of waterjet cutting was a vital part of the rescue.

Sell the rights to the story to a movie studio, and use the funds to get the dog out.

My first idea was to build some sort of balloon/inflatable device that you drop into the hole. By affixing meat to the rope/hose, you can get the dog to climb on top of the balloon as it slowly inflates. Once you've got the dog out of the not-so-cylindrical bottom, you can deflate the balloon to the point of fitting the circumference of the hole. From here you carefully pull the dog up; making sure you stop if it's legs get caught/etc.

I love dogs, like everyone else, but isn't this all a little bit much? Shouldn't they be considering solutions for humanely euthanizing the dog so it doesn't have to die of thirst/starvation?

Argon gas would fit the bill. It's heavier than air, so it would sink to the bottom of the borehole, and it's widely available due to its' use as a shielding gas for welding. Most importantly, it would be humane and entirely painless for the dog-- far more humane than leaving the poor animal down there for days or weeks waiting to be rescued.

Put a noose on a rope with a remote camera. Grab the dog and pull.

Without a remote camera do the same but keep trying until you randomly catch it.

Fill the hole with water. Dogs swim/float.

Gradually fill the hole with rubber mulch. Better friction than something like gravel, lower risk of the dog "drowning".

We need a small size intelligent being in order hold the puppy carefully and place it in a basket or sth like that. Robots? Could work, but agents are usually designed to do a specific task. For saving a puppy from a deep norrow well, I don't know if there any robot exists. Anyway, we dont need to call this an "engineering problem". It's rather a biology problem. Scientifically proven that mature animals have instinct to save the youngsters. I would release down a basket with another dog in it. When it reach the bottom, the mature dog will hold the puppy from the neck, and place it into the basket with itself. So I could bring them all the way up. A small size monkey could work to. We may need a very small training for the saver animal tough, to mitigate the risk of loosing both.

Cut the bottom of a small plastic barrel so that it becomes a cylinder, lower it over the dog, have ropes at the bottom of the barrel to tighten it just enough to secure the dog and bring it up.

The flexibility and uniform shape of the plastic barrel might make it easier to get it down there.

Lower a strong cotton (edit: or some textile, something strong and thick enough) bag into the hole, with the rim of it held open by a strong wire. Large enough for the puppy to climb in, put food in there and something that smells human maybe. Best make the bag a longer tube. Hopefully the puppy will climb into it, getting the food - then try to pull the whole thing up.