Modpack with SCP: Lockdown And addons like Crayfish and SecurityCraft
What does SCP: Extras do for you
SCP: Extras has a mix of SCP: Lockdown Addons which adds to the original SCP: Lockdown and makes more of the SCP world available in Minecraft.
SecurityCraft mostly for multiplayer use and adding of security like cameras, codelocks, lasers and detectors.
MrCrayFish's guns for protection against the strong SCPs, vehicles for traveling around the world, exploring the various facilities, and furniture for them who just want to take it nice and easy decorating around.
The SCP: Extras Team
