Derelict was made for Urban Terror with the layout catering to the 5v5 competitive team survivor play style.

Originally the theme was set around an abandoned dock/factory area, however the focus on the theme and advanced detailing was put aside to focus more on the layout and playability of the map.

The map has intentionally been designed to be close quarters and with multiple sub-routes among the main 3 forks of the layout.
This allows the players to manipulate the movement mechanics of the game for easy flanking or counter-flanking on the opposing team.
This enables players to think forward and try and outplay other players using movement mechanics, rather than being a battle of who has the best aim or reaction time.

The layout was an experiment on changing the play style of competitive play, where players who normally meet at chokepoints, instead fight through chokepoints. Initially this was not well received as even veteran players had to adapt to a new play style that they were uncomfortable with.

As seen in these images, the multiple spawnsets allow for a variation on playstyle and flanking ability. The green paths represent the multiple choices a player has, while the green X represents where the player has a decision to hold or push on their position.

You can see with this layout as opposed to Tohunga, the players do not meet at the main chokepoints but however fight through them. Figuring out the timing and allowing for the multitude of angles and routes was the biggest challenge to implement, but by far was the most rewarding after seeing the results.