There are 2 ferrys a week to Roscoff in France from Cork.Take the ferry.
No direct flights from Cork to Sao Paulo for 5 euro each way on a dead planet.
Ferrys and cruise ships also have huge emissions and including regular sailings from Rosslare and Dublin it would be over subscribed.
It will take years to build more ships anyway.
Copying Pyonyang and Russia might not be the best idea.
Just a guess now mind.