Fallout 3 Wasteland Secrets

Fallout 3 is a combination of the action and role-playing game genres, released by Bethesda Game Studios, as the third major game in the critically and commercially acclaimed Fallout series. Fallout 3 was released in North America on October 28, 2008, in Europe and Australia on October 30, 2008, in the United Kingdom and Ireland on October 31, 2008, and in Japan on December 4, 2008. The game is compatible with the Microsoft Windows, Sony PlayStation 3, and Microsoft Xbox 360 consoles and systems.http://fallout.bethsoft.com/index.html

The game takes place in the futuristic setting of 2277, which is 36 years after the fictional setting of previous installment Fallout 2. It is also 200 years after the titular nuclear apocalypse that demolished the game's Earth. This was in a place where wars and superpower conflicts ended in a Sino-American war taking place during the second half of the 21st century.http://fallout.bethsoft.com/index.html

As such, Fallout 3 places the player in the role of an inhabitant of Vault 101, which is a safety shelter meant to safeguard a minuscule amount of people from the nuclear fallout. When this character's father disappears under unknown circumstances, he or she is compelled to leave the Vault and venture into the wasteland of Washington D.C. to find him.http://fallout.bethsoft.com/index.html During the game, the player is aided by a group of human survivors and must engage in combat with a plethora of enemies that now live in the area known as the "Capital Wasteland". Overall, the game possesses attributes and combat system reminiscent of a typical action strategy game; however, Fallout 3 also utilizes aspects of first-person shooter and survival horror games so that it is difficult to fit it into one genre.http://fallout.bethsoft.com/index.html

Dogmeat

A little bit southwest of the Minefield is a location known as Scrapyard. The player can explore this area and they'll eventually come across a couple of raiders harassing a dog.
It is not necessary to kill the raiders. The dog usually manages to take them out before the player even arrives.
The player can talk to the dog and infer that its master just got killed. The player will be given an opportunity to ask if he would like to come with the player, to which Dogmeat excitedly barks in approval.
From then on, Dogmeat is the player's loyal companion until the day he or the player dies.
The player can heal him to full health with stimpacks by talking to him even in the middle of a firefight.
The player can also tell Dogmeat to go search for items, wait where he stands, or wait over at Vault 101.
NOTE: Dogmeat does not count as a follower. The player is allowed to have one follower and Dogmeat to form a party of 3.http://www.cinemablend.com/games/How-To-Find-Dogmeat-In-Fallout-3-13166.html

Followers

There are a total of seven permanent followers in the game. The player is only able to have one follower + Dogmeat in their party at a time.
Star Paladin Cross: Only obtainable with Good Karma. Found in the Citadel.
Fawkes: Found in Vault 87. When the player rescues him from captivity in the quest Finding the Garden of Eden, he'll help the player out for the remainder of the quest and then leave the player's party. The player will be able to recruit him once again if they have good karma when he comes to rescue the player from Raven Rock. At this point, Fawkes carries a Gattling Laser.
Butch: If the player managed to release the vault dwellers from Vault 101 in the quest Trouble on the Homefront, Butch will be hanging out at the Muddy Rudder in Rivet City. The player can get him to join the party if they have neutral karma.
RL-3: The Mister Gutsy robot RL-3 can be found and purchased from Tinker Joe outside of the Robco Factory for 1000 caps. The player must have neutral karma in order for him to agree to become their follower.
Charon: Charon is a gun for hire that is currently under the employ of Azhrukhal. The player can either buy the contract off of Azhrukhal for 1000-2000 caps depending on the player's speech skill, or the player can kill Greta for him. Once the player gets the contract, tell Charon and he'll kill Azhrukhal. It doesn't matter what kind of karma the player has with Charon; he'll follow anyone who's holding his contract.
Jericho: Found in Megaton. If the player has bad karma and 1000 caps, the player can buy Jericho's company.
Clover: Found in Paradise Falls. Talk to Eulogy Jones and if the player has bad karma, he'll let the player have Clover.http://www.supercheats.com/guides/fallout-3/followers/

Alien Ship

If the player travels directly north of the Minefield, southeast from Cliffside Shacks, or southwest from Vault 92, they will eventually pick up a radio signal titled "Recon Craft Theta Beacon." The player should keep it on and search around the area until they find a crashed alien space ship.
If the signal disappears, the player has ventured too far.
The player must move around to the front of the spaceship and they'll see a dead alien with a Alien Blaster on the floor.
The player should pick up the blaster along with all of the ammo since its the only ammo for this gun that the player will be able to find in the game.
The blaster is extremely powerful and its ammo should be conserved to be used only on tougher foes like Super Mutant Masters, Sentry Bots, Deathclaws, and Giant Radscorpions.
TIP: To the northeast of the Smith Casey Garage, there is a large crater. At the bottom of this crater there is an overturned military truck containing approximately 96 Alien Energy Cells. If the player ever runs low on ammo for the Alien Blaster, this is the best place to restock.http://planetfallout.gamespy.com/weapons/47/Alien-Blaster

The Experimental MIRV Fatman

The Experimental MIRV is easily the most well hidden and most devastating weapon in the game, but it'll take a lot of effort in order to find it.
The first thing the player needs to do is track down all of the Keller Tapes that are hidden throughout the wasteland.
The first tape is located directly north of the VAPL-58 Power Station. A good way to get there is to fast travel to Arefu, head southwest, and look for power lines. The player will find the tape at the base of one of the power lines surrounded by cheaply made walls.
The player can find the second one inside the podium at the Hallowed Moors Cemetery, north of Big Town. A good time to pick this up is during the quest Big Trouble in Big Town.
The third tape is located just outside of Grisly's Diner. The player can get there by heading north from the Temple of the Union which they should have on their map if they've completed the Head of State sidequest. The tape is located on a desk near the back entrance of the diner.
Tape number 4 is located in an abandoned shack on top of a cliff near Rockbreaker's Last Gas. To find it, travel northeast from Little Lamplight, past Everglow National Campground.
The fifth and final tape is located in a Super Mutant tent north of Anchorage Memorial. The tent itself is hidden behind a large jackknifed truck.
Once the player has all five tapes, head to the National Guard Depot on the east of the map. It is located on the east side of the wasteland, northeast of the Vault Tec Headquarters.
Once inside the player needs to fight their way through the depot, through the training grounds, and through the offices until they reach a door that leads to the depot again.
The player will see an electrical switch in front of them that will unlock the utility door down below. The player should drop down and head inside.
There will be another electrical switch nearby that will activate a trap door that will lead the player into the armory.
The player must head inside the armory and ransack all that they need. The player must make sure especially to grab the Small Guns Bobblehead.
Once the player is ready, activate the terminal and unlock the door using the password learned from the 5 Keller Tapes.
At the end of the hall, there will be a Glowing One sitting down. The player should put it out of its misery and then pick up their Experimental MIRV.
The Experimental MIRV is essentially a Fat Man that launches 8 mini nukes simultaneously. http://www.ps3multiplayer.com/forum/fallout-3/19237-fallout-3-secret-weapon-experimental-mirv-fatman.html