Watch as Spezia make the most of a double defensive howler to snatch the points in stoppages, but Mattia Aramu will rue his free kick thumping the crossbar.
It was a relegation dogfight at the Stadio Picco with chances at both ends, as Niki Maenpaa made crucial saves on Simone Bastoni and Rey Manaj.
Aramu had a sensational opportunity for Venezia, his long-range free kick denied only by the frame of the goal.
However, a double error in stoppages handed the winner to Emanuel Gyasi, on the rebound from a Manaj effort.