It was as though Jonah was in a protected submarine sailing underwater. That great fish was sent to rescue him from the sea and its tumults. It was like tribulations, appearing fearful from the outside whilst entailing within them all benefit. Jonah was inside the fish for three days, sound and not conquered by the whale, just as Christ was in the tomb for three days and was not conquered by death.
So should you be, blessed brother. If the Lord prepares for you a great fish to swallow you, do not fear, neither be troubled, nor grieve. From inside the belly of the fish bless the Lord as Jonah did.