Sinwar is considered highly sophisticated and often stays one step ahead of Israel, as seen in his escape with the kidnapped individuals from Shifa Hospital before Israel's invasion. According to the report provided by Walla, Jake Sullivan, the U.S. National Security Advisor, stated that the United States is deploying special teams to assist Israel in capturing and killing the Hamas leader in Gaza, including sophisticated equipment they brought with them, such as ground-penetrating radar, to try and locate him underground.
The U.S. and Israel have established channels to share information on Sinwar's location and other Hamas officials. Significant U.S. assistance has also come through ground-penetrating radar provided to help map out Hamas’s extensive tunnel network across the Gaza Strip, which is estimated to span hundreds of kilometers.
The data from this radar, combined with intelligence gathered by Israel from captured Hamas operatives and numerous seized documents, has helped build a more comprehensive picture of the tunnel network. Sinwar has managed to evade detection partly by avoiding the use of electronic communications for an extended period, though according to American sources, he did communicate with other Hamas leaders via satellite and cellular phones from the tunnels during earlier stages of the conflict.
It was also reported that the eavesdropping on Sinwar’s conversations was the reason behind Defense Minister Gallant’s request early in the conflict to allow fuel shipments into the Gaza Strip. At that time, fuel reserves in the strip were running low, and Gallant pushed to allow their replenishment so that the generators necessary for operating the cellular network in the tunnels would continue to function, enabling Sinwar to keep communicating by phone.
Gallant’s request faced resistance from Netanyahu’s coalition partners on the far-right, although the Times does not mention names, it is clear that it refers to ministers Itamar Ben-Gvir and Bezalel Smotrich. The Times describes their demand to cut off fuel shipments to the strip as a desire to "punish the residents of Gaza."