Hamas militants opened unexploded Israeli missiles from previous strikes to extract explosive materials.

This is the best summary I could come up with:

The unprecedented barrages reaching as far north as the seaside metropolis of Tel Aviv, coupled with drone launches and even an attempted submarine attack, have put on dramatic display a homegrown arsenal that has only expanded despite the choke hold of a 14-year Israeli-Egyptian blockade of the coastal strip.

Israel has argued that the blockade — which has caused severe hardship for more than 2 million Palestinians in Gaza — is essential for preventing a Hamas arms build-up and cannot be lifted.

According to the Israeli military, the smuggling continued, gaining steam after Mohammed Morsi, an Islamist leader and Hamas ally, was elected president of Egypt in 2012 before being overthrown by the Egyptian army.

In a September documentary aired by the Al-Jazeera satellite news network, rare footage showed Hamas militants reassembling Iranian rockets with ranges of up to 80 kilometers (50 miles) and warheads packed with 175 kilograms (385 pounds) of explosives.

Hamas has publicly praised Iran for its assistance, which experts say now primarily takes the form of blueprints, engineering know-how, motor tests and other technical expertise.

The Israeli military estimates that before the current round of fighting, Hamas had an arsenal of 7,000 rockets of varying ranges that can cover nearly all of Israel, as well as 300 anti-tank and 100 anti-aircraft missiles.

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