Beyond Human environment art challenge - Ice age Ark

My second painting for the artstation challenge. This one is very contrasting compared to the first one.
When a small ice age starts, the megacities get destroyed by the harsh weather and looters. The government sends out giant driving Arks to look for survivors in the ruins of the megacity. This one was very succesful though, and the vehicle quickly became overcrowded, with survivors building their shacks on the vehicle like parasites, or small fish staying close to a giant whale.