Supervillain spooky hideout in a underwater dome

A menacing underwater supervillain’s lair hidden in the abyss — a colossal glass dome fortress glowing ominously beneath the ocean, surrounded by circling sharks and schools of fish. Gothic arches and iron pillars frame the structure, bioluminescent corals pulse with eerie light, and shadows dance across the seabed. The dome houses a sinister command chamber filled with strange machinery and secrets, giving off a sense of dread and power. A haunting yet majestic atmosphere, equal parts beauty and terror, perfect for a villain’s final stand