Shalebridge

This location on the map consists of Broken Relay Tower, Shalebridge Tunnels and Shalebridge Hills. The latter two are rival ant colonies. It is considered to be the most glitched area in the game.

Shalebridge

 * There usually is a dead Ant Researcher in a pool of water near the eggs in the friendly ant tunnels (green mushrooms entrance) that has a Big Book of Science on his corpse. Wait 73 hours for the book and the dead researcher to respawn.
 * Quite a bit to the east of Shalebridge Tunnel entrance (Due south of the train wreckage, across the irradiated mud hole) there is an ant egg clutch (it is on the other side of the rocky hill) with a copy of D.C. Journal of Internal Medicine and a Stealthboy underneath the dead Raider. (See Abandoned Car Fort.)
 * If you resurrect the dead ant researcher with console, he will immediately become hostile and attack the PC or any nearby friendly ants. The ants will not attack back.
 * It is possible upon entering to run to the Ant Researcher and find him while he's still alive. He will be hostile and it appears that the friendly ants will be attacking him.

Shalebridge Tunnels
Shalebridge Tunnels is a small cave system that is home to a small, friendly mutated ant colony. The entrance is to the north from the broken relay station located just below the hill and resembles a circular plate or cover surrounded by glowing mushrooms.

When the player enters, the smaller friendly ants are under attack from larger, more aggressive ants. The larger ants will attack the player and can be killed to protect the colony. The larger ants will not be here if you have already killed the queen in Shalebridge Hill.

If you inspect a nearby ant egg cluster, the option to inject a stimpak is given. There is an Ant Compost Heap with some Ant Nectar in it and it will replenish faster upon killing Ant Queen in Shalebridge Hill. The compost pile is toward the back of the cave, to the right, with glowing green mushrooms around it.

If you kill and then search one of the larger ants you will get this message:

Hidden Tunnels
On the local map there are what appear to be openings to tunnels that are not found when you go to that point on the map, two of these make a complete small loop, and another appears to be a long tunnel along the outside of the cave to the left.

Climbing up on the boulders to the left of the first two pillars in the first large room near a small puddle, you will find you can continue to walk up the boulders, staying close to the wall. You should be able to get in on the far left side of the opening. You may need to crouch to get in, but once in you can stand up - even Fawkes can get in here. There appears to be another opening on the left, but you cannot get through this one. Straight ahead or to the right is one of these small loops, it is however a closed loop and does not lead to the long tunnel on the left. The opening to the left of this hidden entrance can be accessed partly from the opposite side. This is directly ahead of the entrance to the Shalebridge tunnels at the south end of the small loop. There is another small opening that appears to be the entrance to the long tunnel below it, on the ground level. You cannot enter either opening, even when crouched. A similar inaccessible opening is at the very end, centered in the back wall of the last cave with the eggs and the compost pile.

Shalebridge Hill
This colony is just north of Shalebridge Tunnels. There is not much here except Ant Workers, Ant Soldiers and an Ant Queen.
 * There are also Mentats, Metal Armor, Jet and Buffout in a pile of bones, through the tunnel on the right as you enter the Invaders/Queens Lair (you have to jump over the rock to get through the tunnel).
 * There are several weapons and a large amount of ammo in the Queen's Chamber.
 * There is a .44 magnum and bullets for it lying next to a rotting brahmin corpse inside one of the side passages from the large portion of the cavern

Appearances
only appears in Fallout 3.

Bugs

 * Freezes and crashes are known to happen in this area frequently, probably due to ants spawning inside walls and other inaccessible areas. Leaving the area and waiting out the respawn period (72 hours) may help. For more involved workarounds, please see the discussion page.
 * Followers can sometimes die when you enter Shalebridge.

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