Familiarity is defined as knowledge of someone or something, or to a feeling of comfort and closeness with someone or something. 1  When you have heard of a brand of computer, this is an example of a familiarity with the computer. When you have lunch with an old friend and fall back into the patterns of your past, this is an example of feeling a sense of familiarity.
The vault symbol is in between the three ammo chests. Head down to the very south of the map (directly south of the exit to Southpaw Steam and Power). Drive / walk around the pond area on the left side of the water. Keep going to the edge of the map and you will see a small house.
Although most vaults today are designed to eliminate the intrusion of exterior elements, water may enter a vault is due to some type of foreign material, such as soil, on the sealing tongue on the base of the vault or in the groove located in the cover of the vault.