|“Hono Mizu was once a thriving port town that was consumed by an undersea volcano that buried the city leagues below an impossibly harsh environment. A combination of fire and water: the Boiling Sea.”|
The Boiling Sea is a boiling sea, consisting of series of undersea volcanos that engulfed the once thriving port town of Hono Mizu.
Hono Mizu, a port town, sank to the bottom of the sea long ago due to underwater volcanic activity. Wu asked Ray and Maya to hide the Reversal Blade in the town's library as only Masters of Fire and Water can survive the journey. Following the defeat of Krux and Acronix after their powers of Time where absorbed by the Time Blades, the Time Blades were used by Wu and Garmadon to open a Temporal Vortex, which they used to dispose of the blades, but Krux and Acronix soon followed them, becoming lost in time. However, Krux would somehow immediately escape, landing in the woods below the monastery and fleeing, unaware of the Reversal Time Blade, which landed directly after he fled. Shortly after this, Wu discovers the Time Blade in the woods. Knowing it was too powerful to keep, he ordered Ray and Maya to dispose of it within the Boiling Sea, knowing that only the current ElementalMasters of Fire and WTER working together could reach the blade through a series of trials.
- The Reversal Time Blade would later be brought back to the Boiling Sea for safekeeping by the Ninja after Krux, Acronix, and Wu were all lost in time.