The feelings of sadness are mixed with pride in Radwan, the brother of the martyr and the late leader of Hamas, Muhammad al-Zawari, as he watches on television what he described as the qualitative operations of the Hamas resistance weapons by air and sea against Israeli targets, which bear the fingerprints of his brother, the engineer.

Radwan confirms to Al-Jazeera Net that the autonomous submarines that the occupation army admitted two days ago to the possession of the Palestinian resistance were the direct reason that precipitated the assassination of his brother by the Mossad in his hometown of Sfax on December 15, 2016.

On Monday, the occupation army admitted that Hamas possesses autonomous submarines capable of carrying 50 kilograms of explosives, indicating that the movement tried to target the gas platform off Ashdod.

Zouari's brother says that after years spent in exile, the martyr decided to return to Tunisia after the outbreak of the revolution and the fall of the Ben Ali regime, to settle in his hometown of Sfax in the south, and to resume his academic activities at the National School of Engineers.

The martyr worked on preparing his doctoral thesis, and it was related to a submarine operating with a remote control system, and Omar did not write to him to discuss it after he was assassinated by the Mossad after the repeated public and secret visits of its agents to the laboratory in which al-Zouari was operating and to clarify the matter of the submarine in addition to the drones.

A model of the submarine in the doctoral thesis of Shahid Zouari (Al-Jazeera)

An Israeli documentary carried by the Palestinian Shehab Agency on November 15, 2019 revealed the reasons and motives that gave the Mossad the green light to assassinate Zouari, mainly related to his development of drones and models of drone submarines capable of carrying explosive devices.

According to the testimony of Israeli analysts, the Mossad officers considered that Zouari's projects were a threat to Israel's security, and could represent a qualitative shift in the resistance's weapons, which would make its sensitive oil and gas installations direct targets for the resistance, which is what actually happened.

The same documentary revealed that Mossad agents secretly entered the laboratory in which Martyr Zouari works at the School of Engineers in Sfax, during which Zouari worked on developing his academic projects, especially the submarine, which gave permission to assassinate him.

Martyr Zouari during his supervision of the activity of the Aviation Club of Sfax (the island)

The testimonies of the family and colleagues of Martyr Zouari confirmed the presence of a Hungarian citizen named Chris Smith to the Engineering School of Sfax in August 2015, and his ability to secretly enter the laboratory where the martyr Zouari works and to see the model of the submarines he was working on.

The same sources talked about the Hungarian person offering the martyr Al-Zouari in January 2016 a project to deal with him within the framework of a European program to exploit drones for the purposes of monitoring oil installations, but the martyr was suspicious and asked his students not to deal with him.

And an article by the Israeli writer, Elior Levy, published in the Israeli newspaper Yediot Aharonot, acknowledged the great role of the martyr Muhammad al-Zawari in developing the marine system of the Izz al-Din al-Qassam Brigades through the unmanned submarines project.

Levy said, "Al-Zouari worked hard to establish remote-controlled marine submarines, which indicates that his assassination came to prevent Hamas from developing its naval military system, and not necessarily for what he provided to the movement in the drone project."

Speaking to Al-Jazeera Net, a friend of the martyr's family and a scientific researcher at the National School of Engineers in Sfax, Dr. Walid Al-Leili, told Al-Jazeera Net that Zouari worked on his doctoral thesis for an autonomous submarine, which was discussed after his death.

He adds that the martyr obtained in 2013 a mechanical engineer degree with a very good grade, represented by the manufacture of a drone.

Our interlocutor emphasized the keenness of martyr Mohamed Zouari throughout his tenure at the School of Engineers in Sfax not to reveal his affiliation with the resistance, and that he had always known himself as an expert in mechanical energy.

Al-Qassam Brigades mourned the martyr Muhammad al-Zawari and considered him one of its prominent leaders (French)

The doctoral thesis of the martyr Al-Zouari - according to the copy that Al-Jazeera Net saw on the deceased in 2017 - after discussion by the Scientific Committee to study the hydrodynamic and dynamic behavior of an autonomous submarine, while the control factors of the submarine are determined on the basis of experimental tests.

It is noteworthy that the Izz al-Din al-Qassam Brigades, the military wing of the Hamas resistance movement, had previously mourned in a military statement on December 17, 2016 the martyr Muhammad al-Zawari, and considered him one of its leaders and one of those who supervised the Ababil al-Qassam aircraft project, which had its role in the edible storming war. In 2014.