An unresponsive male victim of a diving accident is brought to the emergency department where it is determined that immediate surgery is required to save his life. The client is accompanied by a close friend, but no family members are available. Which action should the nurse take first?

Carry on with surgical preparation of the client without a signed informed consent.

Ask the man's friend to sign the informed consent since the client is unresponsive.

Notify the unit manager that an emergency court order is needed to allow surgery.

Continue to provide life support until a thorough search for a guardian is completed.