In the aftermath of Operation Defensive Wall in April 2002, a series of incursions into Rafiah located a number of tunnels. Their destruction marked a limited success for the IDF, but the victory was short lived. Given the fact that an operating tunnel can net some $50,000 a day for the family head who commissions and owns it, the incentive to dig more and deeper tunnels far overshadowed the cost of losing them. Tunnels were dug deeper, some reaching depths of 10 meters and more (over 30 feet), children were employed to dig around the clock, and when poor conditions led to tunnel collapse and the death of a child, there were plenty more to take his place.
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I don't know, I feel uncomfortable about this. Where does he get this information from?