Type 815 spy ships pictures

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The Great Wall of Saudi Arabia :

Kingdom plans to build 600-mile barrier from Jordan to Kuwait in response to the threat of an invasion by ISIS

Defences: This multilayered fence and ditch, punctuated with radar surveillance towers, command centres and guard posts, aims to protect the Saudis' oil-rich territory from invasion by the Islamic State insurgency

The Saudi royal family are building a 600-mile barrier to fortify the northern frontier of their kingdom.

The fence and ditch, punctuated with radar surveillance towers, command centres and guard posts, aims to protect the Saudis' oil-rich territory from invasion by the Islamic State insurgency.

Last week a suicide bombing and gun attack which killed two Saudi border guards and their commanding officer was styled by one analyst as the Islamic State's first attack on the kingdom.

The multi-layered barrier, which will eventually stretch across the Saudi-Iraq border from Jordan to Kuwait, includes 78 monitoring towers, eight command centres, 10 mobile surveillance vehicles, 32 rapid-response centres, and three rapid intervention squads, reports Janes.com.

Citing a promotional video, the defence industry magazine reported the six-mile-deep barrier consists of a ditch, two fences and a patrol road connecting the watchtowers and guard rooms. The video included footage of thermal imagers and battlefield radar systems that can detect individuals at up to 12 miles away and vehicles at up to 24 miles away.