A post on the official Splatoon Tumblr page today announced that Urchin Underpass "will be undergoing important construction work" from August 2-5.

9. Urchin Underpass Nintendo Appearing in almost all of the promotional material for Splatoon and being confirmed for a return in the sequel, Urchin Underpass is the quintessential Splatoon map.

Fixes to Multiplayer Fixed an issue in Urchin Underpass where players could use unintended means to climb the outer perimeter of the stage.

Meanwhile, the online shooter Splatoon 3 is getting a big update on June 12th, which will bring it up to version 10.0. It will introduce 30 remixed weapons and the classic Urchin Underpass map from ...

Urchin Underpass is one of the starting five multiplayer maps in Splatoon. The map is set around a busy freeway, and has a long corridor with wide open areas, with a central choke point.

Blackbelly Skatepark is the third classic stage to come to Splatoon 2 post-release, following the arrival of Urchin Underpass this August and Kelp Dome last month.

Splatoon 3 Season 10 launches June 12, adding 30 new weapon kits, Urchin Underpass, and more. New Series Weapon Power stat will enhance matchmaking, with improved visuals on Switch 2.

Switch 2 is getting a free Splatoon 3 update in June and a new Splatoon Raiders game sometime in the future.

Urchin Underpass, a stage from the original Splatoon on Wii U, is also being added. Splatoon 3 ’s new update drops June 12, for both Nintendo Switch and Nintendo Switch 2.

There are a total of 30 new weapon kits in this collection. A returning stage from the original Splatoon game on Wii U, called Urchin Underpass, will also be added to the stage rotation.

Added a new stage, Urchin Underpass. Added 30 new weapons as part of the Splatlands Collection - Barazushi / Emberz. These weapons will be available in the shops after applying the update.

It seems to be a single-player game. Switch 2 launched on June 5 with Mario Kart World. Splatoon 3 gets an update on June 12. It brings remixed weapons and Urchin Underpass map.