So as we can see from that article, the tunnels are in no way adequate for bringing in the amount of supplies that are needed, just in terms of basic necessities for a population of more than 1.3 million. Relatively small numbers of people drag in small amounts of goods at great risk to themselves and they try to make some money on it, while more than 500 TRUCKLOADS per day are needed to keep the people of Gaza from slowly starving.