The tunnels serve two purposes: to hide caches of weapons and explosives, and to provide an escape route for Hamas leaders through Rafah.
The source quoted mentions that no matter what happens during any Israeli activity, Hamas plans to declare themselves "victorious conquerors" as soon as the IDF leaves by claiming that they "repelled the aggression in Gaza."
The article is unusually specific as to exactly where these tunnels are:
1. Hamas has been digging a tunnel under the house of one of their Qassam Brigades commanders named "Ismail Astal", leading to the ground under Khalid Hassan Secondary School for Boys in Khan Younis and a branch to a school for boys in Bani Suheila, another branch To the house of a Qassam leader Omar Al-Astal, this tunnel will continue to the house of another named Abdel Hamid Al-Astal. All these tunnels under the ground connected with each other.We have seen before that Hamas has dug bunkers and tunnels under even UNRWA schools, and they have fired rockets from schools as well, so this is more than plausible.
2. The Hamas militia dug a tunnel in the house of another person named Ashraf Fahmi Al-Astal, an executive officer of the Hamas, and branches go to the Farhana School for Girls near the police station in Khan Younis and then to Haifa prep school for girls will go to the house in charge of internal security of Hamas in the south Ahmed "duck" (autotranslation.] Also, these tunnels have other ramifications associated with each other and continuous network under the ground.
3. The Qassam Brigades militia group is digging tunnels inside Gaza City and other provinces, including: a tunnel carved in the city of Arafat's police "Passport" to lead the Islamic University and another tunnel from the seat of government house in Gaza did not know its destination yet.