Cement slabs in the middle of nowhere

I shall be investigating the following lead brought to me by a friend and am asking for your ideas on the matter. He is an avid hunter/recreational fisherman and he works as a contractor who makes asphalt and cement roads. I'm quite sure he knows what cement looks like.

The first cement slab is approx 4 feet on each side. It is located about 30 feet from a brackish water river and protrudes about 6 inches above the surrounding ground. The ground is about 8 feet above the water level at high tide. He dug 2 feet down on one side and still encountered cement. The nearest man-made structure to it is a village about 20 minutes away by boat. There are no roads leading to the slab.

The second cement slab is located about 150km inland from the first slab. It is also approx 4 feet square, protrudes 6 inches above the surrounding ground and is located on the plateau of a hill. The hill is not the tallest around, and is surrounded by approx 25000 Ha of flat land. The nearest village is 30 minutes of walking thru jungle. There are no roads leading to the slab. Native huntsmen at the nearest village said that the slab had been there since their fathers were boys, so there is a possibility they date back to WW2 or earlier.

My questions:
Did the Japanese Imperial Army ever make such slabs as a machine gun or spotter platforms?
Could such cement slabs be caps for abandoned mine shafts?



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http://www.thunting.com/smf/index.php/topic,26347.msg185114.html#msg185114

Yeah that was my first thought about the slab by the river...it could have been a landing point. But 2 feet thickness is a bit much. Anyways I shall investigate and try to solve this mystery.

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http://www.thunting.com/smf/index.php/topic,26347.msg185139.html#msg185139

Ideas are what I'm looking for and you have several good ones, Clifftopdigger. The slab on the hill may be the top of a ventilation shaft or a periscope shaft of a sizeable underground complex; was pouring thru photos of Japanese and British WW2 bunkers yesterday. Once this rainy weather clears up, I'll make arrangements to see the slabs. Till then, this mystery is like a maddening itch I can't scratch!

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http://www.thunting.com/smf/index.php/topic,26347.msg185218.html#msg185218

Might not sound hollow if its a platform for lowering materials/goods into a hole thats been buried! Theres only 4 places to dig if it don't sound hollow. Each side,or bang a big rod into the ground at several points to see if it hits something.

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http://www.thunting.com/smf/index.php/topic,26347.msg185270.html#msg185270

Yes GD. 150 km was noted. I'm wondering if the river one is maybe the most hospitable route to the similar in every size one by the river, to be unloaded and MAYBE, Travel across land in some sort of animal trail etc. This would possibly be the only way through such terrain (if connected with each other).
There are instances where ancient builders built structures hundreds of miles apart, yet are believed to be in perfect alingment and symetry,that some experts claim are not an accident and deliberately placed.
Another example of the skills of the ancient builders was channels,which would point to the fact that they were water channels to aid in perfect levels. (the earliest known equivelent to the spirit level)!

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