Create: Deep Seas - Lava Fix

Inside a sealed submarine that has been pumped out and is submerged in lava, the game's damage code still applied fire and lava damage to players standing in the emptied space. The mod changes those damage checks to account for the sealed submarine, so the interior is treated as safe air. When a player climbs out of a sealed compartment, the mod notices the move and turns off the fire overlay that would otherwise flicker across the screen.

The fix targets the interior behaviour of Create and Deep Seas rather than the outer hull. Players are protected while standing in hatches and doorways near the lava surface, while seated in Create seats, and while using ladders and trapdoors inside the submarine. Ticking fire damage that continued after a breached hull was re-sealed is also addressed. The mod is published for NeoForge only, for 1.21.1 – 1.21.11, and it runs on client and server, so both the server and every player need it.