On Monday, four workers clearing a drain during a panchayat project were injured when a hollow brick compound wall collapsed following heavy rain. Thiruvananthapuram: Four workers were injured after a compound wall collapsed on them while they were cleaning a drain at Vedivechankovil near Balaramapuram in Thiruvananthapuram on Monday. The workers were cleaning a drain as part of a panchayat project when the wall, made of hollow bricks, collapsed.