How be ye recover yer treasure?

[emdiesse]

When ye stumble across blackbeards booty how be ye loot it?
How be you raise it?
How be you land it?

I have seen on here how people have located some rather large items whilst freediving; How do you get your finds to the surface? In scuba if it were that big you'd probably be using a lift bag. So failing multiple daft and dangerous dives (Where boyles law and raising the odds of the bends are against you) to fill the thing up what do you do?

Could try hauling the thing up using a rope onto a boat, kayak, float? Use a pully system? Tie off a rope head up grab some sort of lift bag and small cylinder and pull yourself back down to the object.

One you have it to the surface, how do you get it to shore? Do you pull it aboard, attach a float and drag it?

Cheers,
Matt

 

[devondave]

Never mind all that, where did you get the pirate smiley?
And welcome to db.

 

[emdiesse]

Never mind all that, where did you get the pirate smiley?
And welcome to db.

Ah googled it, copied the URL and used the insert image icon

to place it here

Ta very much.

 

[Jon]

I tie a rope to it and haul it up from the surface. If I'm on a boat I pull it up on the boat. IF I just have my kayak, or float, I'll tie it off to my float/boat and drag/paddle it back to shore. I've been able to strap three anchors to the bottom of my Best Hunter float and swim it to shore. Larger Items I pulled up onto a boat that I was on.

Carrying along a life bag and bottle is a bit of a pain with freediving. I have brought up large items on scuba (planes/boats), but that usually involves bringing down multiple bottles of air to plug into the bags and lift- something which I'm unwilling to do while freediving. I do have an old horse-collar BC with a buddy bottle built into it that I guess I could use, but the rope hauling method has proven to be the simplest solution so far.

Just my $0.02

Jon

 

[emdiesse]

I tie a rope to it and haul it up from the surface. If I'm on a boat I pull it up on the boat. IF I just have my kayak, or float, I'll tie it off to my float/boat and drag/paddle it back to shore. I've been able to strap three anchors to the bottom of my Best Hunter float and swim it to shore. Larger Items I pulled up onto a boat that I was on.

Carrying along a life bag and bottle is a bit of a pain with freediving. I have brought up large items on scuba (planes/boats), but that usually involves bringing down multiple bottles of air to plug into the bags and lift- something which I'm unwilling to do while freediving. I do have an old horse-collar BC with a buddy bottle built into it that I guess I could use, but the rope hauling method has proven to be the simplest solution so far.

Just my $0.02

Jon

True, apparently to lift 1kg of weight you need to displace 1kg of water which apparently, convieniently, happens to be 1litre of water (at sea level).

I'm not going to be so hot here on the calculations but say you have an item of 100kg (pretty big for you to be wanting to tow it back anyway) at a depth of 20m then to hold it at surface you would need 100L of air? At 20m (3 bar) do you then need 33.3L or do you need 100litres of air at that depth which would end up being 300litres once it got to the surface... (obviously having to dump air out the bag on the way!) If you need 100litres, then could you not carry a small 1.5L 232 bar cylinder for 348 litres of air.

Then you'd be able to dive down attach the lift bag fill it to a third (let the lift bag lif the heavy item) and you only have to haul up the small 1.5L cylinder.

I suppose the other arguement is whether the item you are trying to lift is worth going out there to buy some sort of 1.5L to 3L cylinder?