This rudimentary British-built watchtower is the only thing standing between Islamic State fighters and thousands of Lebanese Christians, Druze and Muslims.
Tango 10 is one of 12 fortifications built in haste along the Lebanese border with British help.
The threat of invasion here from Islamic State militants across the barren landscape is constant.
In August, Aarsal, a Sunni village a few miles to the south of where Tango 10 now stands, was over-run by jihadis from Syria.
The Lebanese army retook Aarsal after three days of fighting, but 19 Lebanese soldiers were kidnapped, and several have since been beheaded in Syria.
A small British team of former soldiers and engineers have been working flat out to build a new stronghold to protect the area.
Vdeo by Heathcliff O'Malley
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