 While the concept remained the same of an AI character that protected the "gatherer" AI characters in the title, many ideas were considered for their mobility and execution, including a wheelchair mounted version.As the designs for the individual types evolved, intricate details of the actual diving suit were worked out piece by piece, using the concept that the suits would be constructed from salvaged parts of the city.Developer Ken Levine noted that with the concept of the gatherers as little girls, it allowed the team to explore the protector role of the character and demonstrate it in a way to appeal to a real-world relationship for the player.