Me too 
I did think that, mind you it’s a bit dangerous / accessible to Jo public too be very deep 
Image from apple maps is interesting.
Looks concrete lined and the level of whatever is in it is lower than the image and google maps.
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I thought the same. And 1700m to the south is the world’s deepest hand-dug well 
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Well done @callum. We can all stand down now 
@clinkadink you need to head out there, this is your forte.
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Is there not or was an army base at burgess hill.
Depending how far away or am I miles off.
“Couldn’t be a dew pond could it? Does it definitely go into the earth like a mine shaft, or could that be the dark surface of water? Sometimes dew ponds have a built up perimeter as in your photo. Interesting!”
Dew pond then?! Some lined with clay, some with concrete. I thought the edges looked like sunlight in shallow water + the marginal plants.
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Just a thought, a soak away.
Dew pond with low water level?
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Off to ask google what a dew pond is, brb 
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Just done that
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A dew pond does look the mostly likely thing from everything i have googled.
Theres some remains over to the east about the same size but that looks extremely old.
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That solves it then
Oh good!
There is also a light plane in a field about 2.6 miles SE of it 
Not that I have been searching the other fields for hours.
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My google search came up with flint mines and gypsum mines ?……concrete surround could have been added later for safety reasons ….or are we sticking with the dew pond theory
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I’m no expert but looking at dew ponds I’m not so sure, not going against the odds but I’m not quite 100% convinced it’s a dew pond.