With access to the ocean, survivors will soon find their best source of food to be in the oceans. After the shift, the burping volcanoes put CO2 into the atmosphere, which is best pulled into vegetation in the great kelp beds in the oceans. Water migrates, spreading nutrients and fish in all directions, so all the oceans eventually rebound, and heartily. Survivors are encouraged to plan for this outcome, becoming familiar with fishing practices, and planning to move toward the coastlines after the shift.
Note African Rift Valley commentary.