Of a world in coronavirus turmoil, they may know little or nothing.
Submariners stealthily cruising the ocean deeps, purposefully shielded from worldly worries to encourage undivided focus on their top-secret missions of nuclear deterrence, may be among the last pockets of people anywhere who are still blissfully unaware of how the pandemic is turning life upside down.
Mariners aboard ballistic submarines are habitually spared bad news while underwater to avoid undermining their morale, say current and former officers who served aboard France's nuclear-armed subs.
So any crews that left port before the virus spread around the globe are likely being kept in the dark about the extent of the rapidly unfurling crisis by their commanders until their return, they say.
"They won't know," said retired Adm. Dominique Salles, who commanded the French ballistic submarine squadron from 2003-2006. "The boys need to be completely available for their mission."
"Since there is no internet, no radio and no television on board, the only news you get comes from messages received by the commander, and the commander filters the messages to not give all of the information to everyone."