Israel temporarily closed the Kerem Shalom border crossing after it demolished the 1.5-km long tunnel that ran past Israeli military posts as well as gas and fuel pipelines.
Israeli jets struck part of the tunnel and a new set of sophisticated "tools" destroyed the rest.
The Israeli military says it likely thwarted an imminent attack on Israelis. Israel has placed a high priority on halting the tunnel threat since Hamas infiltrated Israel during the 2014 war.