At the very least MOAB’s would put Hamas out of the tunnel business.
MOABs are probably ineffective, the max overpressure is relatively low. All you need to take out tunnels is a firehose dipped in the Mediterranean at one end, and a pump at the entrance on the other. Flood ‘em.
No ... you need the MOP for that. "Massive Ordnance Air Burst" destroys surface structures. "Massive Ordnance Penetrator" destroys subsurface structures.