I am sure if it was known where they are there would be a 2,000lb bomb heading their way. My experience suggests that the martyrs tend to be the low levels of the organisation and that few of the upper echelons tend to be of that persuasion.
Obviously Iran is heavily involved and they are providing a lot of the logistics and support. They are effectively immune too far away, too big.
Reminds me of the Yom Kippur war when the IDF was 100km from Cairo, lets say they took it, then what?
The only logical option I can think of is to clear Gaza, bulldoze everything, but I cannot see that happening.