Hi, yeah I worked at Melbourne, Tullamarine Airport from the age 17 to 27 as an equipment driver and loader for the now gone Ansett Airlines. Damn those jets APUs made some serious noise as well as them taxying in to the Gateways and firing up to leave them. I wore ear protection but know how loud it is without them from those times you'd take them off to hear something someone was trying to tell you. You'd have to yell your head off to be heard.
A guy I worked with in our gang, gang typically had six in it back then, a driver and 5 loaders, wandered towards the 737 that was taxying in to the gateway walking straight towards the still running engine! We were screaming at him to stop, no way he could hear us. The only thing that saved him from death was about 10 feet away he tripped on a small refueling earthing dome that they clip an earth lead onto when refueling and landed flat on his face. I thought he was gone. They usually come in under low engine speed but that day they gave it some more grunt as they backed off too early. It was terrifying to watch. Iv never been so happy to see someone fall flat on their face on concrete. 👍