The Endless Sea (also known as the Endless Ocean) is the sea that surrounds every island and landmass in the world.
The Endless Sea features many fish and other water creatures, including starteeth, leviathans, fangfish, and other monsters. It also used to be a safe haven for pirates, including Captain Soto and Nadakhan.
Upon waking up, the Ninja and Wu do some stretches while sailing the Endless Sea. When he realized they weren't paying attention, they have to train until they can solve his riddle. When there's trouble at Darkley's, they left the Sea.
Zane tests his breath-holding record at the bottom of the Sea.
Two hundred years ago, Captain Soto's crew sailed on the Destiny's Bounty looking for the Dark Island. When No-Eyes Pete crashed into Ninjago's shores, the ship sank, killing its inhabitants.
In the present, Garmadon's crew flew above the Sea to chase after the Ultra Dragon. When Garmadon summoned the pirates, they flew away from the Sea to Ninjago City.
Lord Garmadon and the four remaining Serpentine generals fly over the Endless Sea to try to find the Dark Island. After searching all day, Skales pushes Garmadon into the ocean so he can become the new Serpentine leader.
The Ninja used their their Elemental Powers next to the Endless Sea's shore. Later, the Ninja fell down the cliff, splashing in the Sea.
The Stone Army reached the coast in order to fire Dark Matter in Ninjago.
With no way off the island, Kai suggests they swim, but backed out after the water reached his chest.
When Lloyd reaches the cliff, the Overlord forces him to stay or Garmadon will be dropped into the Sea. He had Wu drop him anyway, as he's of no use to them.
The Nindroid MechDragon plunges into the Sea, where the Overlord emerges as a physical form.
In the Sea, Pythor and the Nindroids swam toward the MechDragon, where the Overlord is located.
After travelling across the sea, the Elemental Masters arrived at the island.
Nya, along with Dareth, secretly boarded Chen's ferry to find the Ninja.
Dareth was captured by the Anacondrai Cultists when he almost fell into the Sea.
Chen's blimp flew over the Endless Sea to fly above island, where the remaining Elemental Masters have to find Nya.
The Elemental Masters flew over the Sea to reach Ninjago Island.
In a dream, Kai tells Lloyd he'll take care of him right before a Fangfish jumped out of the ocean.
Hoping to find Ronin, the Ninja arrived on the docks, where a fisherman is pulled into the Sea. Later, the Ninja help complete the dock, but didn't get paid when they ruined it.
Kai chased Morro to the Sea for the Scroll, and had to be picked up by Ronin.
The Ninja traversed under the Sea using R.E.X. to reach the tomb. Meanwhile, Wu, Misako, and Nya landed the Bounty above the tomb's location, with Soul Archer and Bansha not far away.
Lloyd commanded the Ninja take out Stiix's support beams to drop the Preeminent into the Sea. When the Ghost Warriors supported her by surrounding her with houses, the Preeminent chased everyone to Hallows Trenches, destroying her.
Near the sea's shores, Nadakhan used the Realm Crystal to bring back his crew.
Later, Captain Soto told the Ninja about trapping the Djinn during their fight on the sea.
After Lloyd and Cole flew over the sea on their Dragons, they failed to find the Misfortune's Keep on Gypsy Cove. They assumed it was repaired and took off to sea.
The remaining Ninja built a raft to get off the Tiger Widow island. It starts to break apart, but Ronin and the detectives rescued them after realizing that the Ninja are not criminals.
Jay and Nya made a Hydro Electric Dragon before they could fall into the sea.
- The Endless Sea caused the demise of multiple characters.
- Deepstone is found and mined at the bottom of the sea.