Barnet were plunged deeper into the League Two relegation battle as Barry Corr wrapped up the points in a 2-0 win for Southend.
Anthony Grant had given the Shrimpers the lead after 25 minutes before substitute Corr smashed home a second after the break following a comedy of errors in the Barnet defence.
Goalkeeper Liam O'Brien's loose pass was intercepted by Ryan Hall who calmly squared the ball for Corr to hammer into an open net.
It was no more than the visitors deserved as they dominated proceedings at Underhill.
Barnet had had the first chance of the match with Izale McLeod firing at keeper Rhys Evans. But it was no surprise when Southend took the lead, Grant latching onto Bilel Mohsni's threaded throughball.
Mohsni could have got his name on the scoresheet soon after but he could only head over the bar.
The Bees looked more of a force after the interval with Mark Marshall fizzing an effort wide of the post.
But their chances of a comeback were ruined when O'Brien's pass was intercepted and Corr bagged the winner.
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