Nemesis Reborn is a Bolliger & Mabillard coaster at Alton Towers, built down into a pit. It opened in 1994, closed in November 2022 for a full retrack, and reopened in March 2024 with the same layout.
You queue round it and sometimes underneath it, with the trains flying past a few feet from your head.
Once it’s down the first drop, it doesn’t let go. There’s no coasting bit at all until the brake run. It’s really smooth for something this relentless, because it’s all forces and the track barely rattles. You’ll still walk off a bit shaken.