Over the past few weeks, Hamas executed dozens of tunnel excavators, according to a Mako report.
A source in Gaza, familiar with the tunnel industry, told Mako that Hamas suspected these tunnel diggers had information on the location on the tunnels, including their entrances and exits. Hamas was afraid the diggers could have passed the information on these tunnel to Israel.
In other words, not only did Hamas employ children in the construction of their tunnels, resulting in about 160 children dying (as noted in an earlier post), but they also deliberately killed other workers, just to keep them quiet.
Read the full story at the above link. You can also read the Mako report, if you read Hebrew.