Astonishing discovery of old fort reveals explosive history | What On Earth | Science Channel

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0:00The ditch is around 800ft long and 26ft wide, and

0:04appears to form the outline of the triangle

0:07in the image.

0:09The entire length is paralleled by the biggest

0:13concrete wall I think I've ever seen.

0:18A section of the wall draws Giannulli's eye.

0:24Holy cow! Look at this.

0:28These look like pock marks from some sort of

0:32explosion. Some of these are half a foot to almost

0:36a foot deep. This has to be the result of

0:40artillery fragmentation.

0:43I can see what's going on here.

0:44This is definitely a fort.