What happens when a Domain Registar is down for months with no end in sight?

The registrar is Register.To -

Website has been showing same message for months.

Twitter account is silent since January.

What options do I have?

I would love to login and transfer my domains, but I am unable to login. Since page is completely down.

The TLD belong to the Republic of Tonga.

This is unprecedented. And I'm at a lost.

Do domains expire on said Registar regardless?

I have a very Profitable SaaS on a .To domain.

If it goes down , I'm looking at $10k/day in loss revenue.