on the final stages on the battle for the syrian city, the last major stronghold of the islamic state. the bbc's quentin sommerville described an ironclad deathtrapf a city with minefields with no option for escape. and the city was trapped during -- the video was shot during the weeks spent in raqqa, syria. >> this is the center of raqqa, the very heart of the islamic state. lying roundabout are a few missiles. hundred locals call it the circle of hell. for these fighters, it is critical territory to retake. but it is much more than that. they are the comrades and the friends of the crucified. when they take that territory, they will cleanse raqqa of islamic state. moreefore the cleansing, blood has to be spilled. the men are pinned down. they are almost in panic, so desperate. again, an airstrike is called in. this time, it works. finally, they can get to him. he is rushed to a field hospital. but he does not survive. he was 21 years old. the fighters are exhausted. they have had too many days end like this. >> congratulations, quentin and darren. this is quentin's second win. he won last year 2017 for the challenges involved in fighting isis.