Passengers could still be alive in air pockets inside the sunken superyacht. But it's a long shot and time is running out.

• Divers are searching for missing people from the sunken superyacht Bayesian near Porticello, Italy.
• An expert told Business Insider they're likely looking for air pockets in the vessel.
• But it's unlikely survivors will be found, the Italian coast guard said.

Divers are searching the sunken superyacht Bayesian for air pockets where survivors might be trapped, but experts and officials say the mission is hampered by dangers and limited time.