Minerva's Den (DLC)

"I dreamed a computer that could think for itself. And using Rapture's technology, I made that dream reality, a machine that could actually think, reason for itself."

- Charles Milton Porter

"The Thinker, the most helpful machine in Rapture!"

- Public Address Announcement

Minerva's Den is a singleplayer Downloadable Content for BioShock 2 and was initially released on August 31, 2010 for Xbox 360 (800 Microsoft Points) and PlayStation 3 ($9.99). This additional campaign is a self-contained narrative experience that puts players in the role of another Alpha Series Big Daddy in a previously unexplored section of Rapture. The DLC was officially released for the Windows platform on May 31, 2011 in the Games for Windows Live marketplace and was later released on Steam on October 2, 2013.

Minerva's Den shows another vision of Rapture within Minerva's Den, a high-technology center of the city, and explores the backstory of the Thinker, a supercomputer responsible for the control of many automatic devices and systems in the underwater utopia, and its creator Charles Milton Porter.

Overview
Players take the role of Subject Sigma, another Big Daddy of the Alpha Series, reactivated and sent by Brigid Tenenbaum to Minerva's Den while the events of BioShock 2 are taking place elsewhere. Sigma's task is to help Porter, founder of Rapture Central Computing, retrieve the blueprints and codes of The Thinker from Porter's former colleague Reed Wahl, a brilliant mathematician turned mad by splicing and obsessed in solving the absolute "predictive equation." Porter and Tenenbaum seek to recreate the Thinker on the surface and to use it to find a cure for the ADAM sickness afflicting Rapture.

Storyline
In 1968,   a newly reactivated Subject Sigma is making his way to Minerva's Den. Reed Wahl, seeing Sigma's arrival with dread, detonates the explosives blocking a tunnel through which Sigma was walking, sending him to the ocean floor. After regaining consciousness, Sigma is contacted by Porter, who is looking for help to retrieve a copy of the Thinker's programming, his life-work, which he wishes to take with him when escaping to the surface. Tenenbaum seeks The Thinkers computing capabilities to synthesize a cure for the effects of ADAM on Rapture's remaining population.

Guided by Charles Milton Porter, Sigma enters the Minerva's Den facility through a maintenance access airlock. Reaching the main entrance in complete darkness, he finds Wahl has posted several Splicers to stop him. After restoring the main power to the facility, Sigma heads to the Executive Wing to retrieve the Operations Access Punchcard hidden in Porter's office. This is needed to access the Computer Core through the Operations sector. After the punchcard is recovered, the Operations access is still blocked by a magnetic lock, which can only be removed through the use of the Gravity Well Plasmid. According to the Thinker's records, the plasmid could be found at the Air-Tite Archives, but first an Electro Bolt Plasmid is required to force open a malfunctioning entrance door. Another detour is then needed into McClendon Robotics to retrieve both the genetic enhancement and a Hack Tool. Once all those tasks are done, Sigma can finally continue on his way to Wahl and The Thinker.

Along the way, it is revealed to Sigma that the two founders of Rapture Central Computing had opposing visions of how The Thinker should be used. Wahl wanted to use the machine's remarkable computing power to generate an algorithm capable of predicting anything. Porter, on the other hand, was using it for a more personal purpose: to have the Thinker emulate the voice and personality of his long-dead wife Pearl, whose grief for he was never able to overcome, even after joining Rapture.

At Operations, the Big Daddy is first asked by Porter to salvage a signal beacon from a sunken bathysphere in the nearby junkyard outside the building, then to reprogram it in Wahl's office at the Programming wing. This part is important to their escape plan, as the reprogrammed beacon will render Porter's private bathysphere invisible to the torpedo launchers set by Sofia Lamb to prevent anyone from leaving Rapture. Once it has been done, Wahl causes the computer coolant system to block the way to Mainframe Access with ice. While going through Climate Control to remove that obstacle,  Wintry Houdini Splicers attack Sigma. After correcting the environmental temperature control, Alpha Series Big Daddies controlled by Wahl attack Sigma. After defeating them, with no more trials set for him, Sigma can reach the Compuer Core sector. The Thinker awaits, but so does Wahl, whose equation predicted that conclusion. More important to Sigma, the Thinker is also the key to the mysteries surrounding his own identity, and Porter's reappearance in Minerva's Den after being framed by his former colleague and imprisoned at Persephone 10 years previous.

Reaching the Core, Wahl locks the main access forcing Sigma to pursue him through the Access Shafts. At their exit, he discovers an audio diary revealing  Porter had set a hidden protocol for The Thinker before being arrested by Ryan's men. This Departure Protocol set the machine to find a way to escape the failing city on its own. At the Core room, where lies the gigantic mass of computing devices forming the machine, Sigma is asked by Porter to go to the code printer and confirm his genetic identity. However Wahl, as a final obstacle, shuts down the Thinker, putting in jeopardy the whole city, which needs its control to stabilize its many vital functions. Wahl, after sending more Alpha Series protectors to attack, then confronts Sigma directly. With Wahl dead, Tenenbaum, who had reestablished radio contact with Sigma when The Thinker was shutdown, tells him to recover the Administrator Punchcard from the pockets of the mad engineer Wahl. The Thinker is reactivated and Sigma's genetic identity, upon printing its programing code, is discovered to be Charles Milton Porter.

The Porter previously on radio reveals himself to be the Thinker itself, emulating the personality and voice of its creator. Tenenbaum explains that using a familiar voice was the only way to guide Sigma through Minerva's Den, and that the machine acted on its own free will to help Porter escape, something neither he or Wahl would have imagined the Thinker capable of. With his identity restored, Porter walks through his private office to reach the bathysphere dock where Tenenbaum awaits. He passes by the many souvenirs and memories his wife left behind and which he brought to Rapture. He finds an audio diary  which reveals that upon achieving giving the voice and personality of his wife to the machine, Porter abandoned the project   He had finally realizing that he could never bring Pearl back to him that way to overcome his sorrow.

It is revealed in the epilogue that Porter and Tenenbaum were able to return to the surface world in the submarine, and that she was able to restore his former body and voice with the cure she was working on. Standing in front of his wife's grave, he leaves a letter in which he apologizes to her for trying to use The Thinker to bring her back, and that he finally decided to let her go.

Main Characters

 * Charles Milton Porter
 * Reed Wahl
 * Subject Sigma
 * The Thinker

Locations

 * Minerva's Den: A center for high-technology in Rapture, housing McClendon Robotics, a robotic company responsible for the production of many of the city's automated devices, the Air-Tite Archives dedicated to the secure storage for the possessions of Rapture's inhabitants, and the Executive Wing of Rapture Central Computing, the company providing to the city its computing services.
 * Operations: The Programing wing for RCC and Climate Control of The Thinker.
 * The Thinker: The Thinker's Computer Core room.

Gameplay
The player has access to a new weapon (the Ion Laser), a new Plasmid (Gravity Well), and a new Gene Tonic (Master Protector, only if the player has completed the Protector Trials DLC). Minerva's Den also features new types of Splicers, such as the fiery Brute Splicer and the wintry Houdini Splicer, as well as new Splicer skins with unique personalities. A new type of Big Daddy, the Lancer, is capable of using the aforementioned Ion Laser. Security Bots in this campaign have an expanded range of weaponry, and are outfitted with Grenade Launchers, Ion Lasers, and a lightning rod that allows the device to deal electrical attacks.

Instead of Power to the People stations, the player finds original and upgraded versions of weapons throughout the campaign. Upgraded Plasmids are also available in the beginning, provided the player has purchased the previous levels of Plasmids (one exception is a Level Two Incinerate! found in Climate Control). The Research Camera is also not present, instead the player may find certain Gene Tonics that come as a result of research scattered throughout the levels. ADAM Sea Slugs are also much more prevalent, appearing both in the ocean and inside jars located in various places. Sigma must break the jars to obtain the slugs inside them.

Exclusive Enemies

 * Fiery Brute Splicers
 * Wintry Houdini Splicers
 * Lancer-type Big Daddy
 * Upgraded Security Bots

Exclusive Weapons

 * Ion Laser

Exclusive Plasmids

 * Gravity Well

Exclusive Gene Tonics

 * Drill Dash
 * Master Protector

PC Release History
Although 2K Games had initially promised to release Minerva's Den for PC on the GFWL marketplace, the decision was later revoked as a result of "timing and technical issues." 2K apologized to the players, as they had promised that this content would be forthcoming to the Windows platform, and that if the situation changed, they would offer it in the future. 2K later explained that in trying to prepare patches with support for the additional content, they encountered bugs under specific circumstances that they felt would not be acceptable to the Microsoft certification process, and while they had tried to correct those bugs, they were unable to do so in a timely manner, leading to their decision to abandon the attempt. The announcement was met with heavy criticism from many players who felt that 2K Games took advantage of their "goodwill" in the promised game and DLC updates. In late October, 2K Games reversed their decision based on the players' responses, and have recommitted resources and support for the content pack on the Windows version. Minerva's Den was released on May 31, 2011.

In 2013, users found Minerva's Den listed in Steam's Registry, which suggested that this DLC would see a Steam release in the future. Because Games for Windows Live closed its store to new purchases, Steam is now the only method to obtain the DLC on the PC platform. It was finally added to Steam on October 2, 2013, and was given for free to those who previously bought the game on Steam or any other retailers, and allowed retail versions to be registered to the gaming platform.

Trivia

 * Minerva is the Roman name of Athena. Both are goddesses of wisdom, which seems to apply to Rapture Central Computing, which is in Minerva's Den (named as such to prevent it from being confused with Athena's Glory).
 * Most of the Splicers encountered in Minerva's Den do not appear to have as many noticeable physical deformities as the ones encountered in the other BioShock games. Although, this may be because this district is isolated from the majority of Rapture.