Hellbender: Ravaging ops is a fan-made spin-off to 1996 Microsoft's hellbender, aiming to at least partially give fun and enjoyment of original's descent1-ish gameplay.
Showcase for ver. 0.0.5 (release will be as soon as moderation update news).
In this version key new elements are:
1. Avionics switching which essentially is auto-levelling system.
2. Destructable objects