[GTP]

Interesting, the different way we use mochas can explain why you have stories about explosions: our way is definitely putting less stress on mochas, which end up lasting for decades without the need to be replaced. We use coffee that is specifically ground for mochas, and we fill the chamber with water up until just below the valve (or, at the very limit, the water reaches half the valve). You still hear a sound when the coffee is ready, but it is caused by little sprays of coffee mixed with hot air, not steam.