Martion 3 Layer Base

Layer 1: Underground storage left open for access to supply's, Opening for Large elevator to carry large suply's to surface
Layer 2: Green house for home gron food and natural oxygen supply and Co2 filtering, Above ground water storage heated by natural sunlight
Layer 3: Steel dome with high impact resistant plastic paneling for protection, equiped with triangle shaped solar pannels for energy, opening for elevator, above ground living quarters.

Opromizable for large and small scale Mars occupation mission