Probably a scientific centre.

Considering Red(Sedna) is more of a storage and supply base, Green(Viper) is a hospital, White(Angler) is sort of HQ? Maybe communications base, maybe even both. Orange(Lantern), is a base in case of emergency.

And since the whole map is most likely a facility for researching the depths, Blue(Grallator) most likely was a research base, since there is no base for actual scientific purposes.