I was at the Fagradalsfjall eruption at 2023. Had been to Iceland for two weeks w wife and daughter, and on the last day (since the signs were there) I decided to postpone travel home for two days (w + child wanted to go home). On my last day, the hike opened up and I went at approx 2100 hours to the volcano. That was an approx 10 km hike one way.
Amazing experience. A bunch of us were stupid as can be, but got as close as approx 50 m. Sounds really dangerous, but the sputter were not that violent yet, and the ground sloped away from us. Still, really stupidly dangerous (the sputter wall could've broken down, wind direction change, etc). But it didn't. Lots of moss fires, and walked into a small slope and immediately felt a sting in my nose and lungs from trapped gases so took that as a nope and went back.
Started walking back at 0130 something, boarded flight at 0600, fainted (I had done Mt Esja in the morning too). Sorry other passengers, it was inconsiderate of me and I was an asshole for that. But... that experience...!