Is there anybody out there?

Set in the future on a war-ravaged Earth, four soldiers man Sentinel a remote military base in a vast ocean that separates two warring continents. They await the relief or the enemy, whichever comes first. But as the empty weeks turn to months, a paranoia descends testing relationships to breaking point. Whilst their tour of duty ended three months ago, the relief crew still hasnt shown up. Alone and uncertain as to their fate, the simmering tension amongst the crew only escalates when a mysterious boat drifts into range - is it the help they have been waiting so long for, or something far more sinister?