I would love for a shipment of dildos to be found, along with a shipment of books with at least one titled Teledildonics Programming in Python for the Professional Programmer, 3rd Edition: Updated with a new chapter on TCP/IP latency reduction.
I see it now, future oceanic archeologists uncover the container and publish an article about a long lost undersea civilization that used container as part of an religious site where they made offerings to their gods as part of a ritual. It will remain a mystery as to why the civilization left the site and disappeared but the team will be soliciting more funding to continue its research.