There was a Roman era galley found in mud in a river in Vietnam IIRC.......................
This wouldn’t come as a surprise to me — in the Han Court records, a trade mission from the Roman Empire was found, even naming the correct emperor (Marcus Aurelius, transliterated). And the Chinese sent a trade mission during the early years of Hadrian’s reign (the catamite-loving pajama boy Hadrian had already abandoned Mesopotamia) which missed.
Remains of a Roman ship in Vietnam, that sounds familiar, but I turned up nothing about that in particular.
https://english.vietnamnet.vn/fms/art-entertainment/114502/10-ancient-ships-found-in-binh-chau-waters—archaeologists.html
https://archaeologynewsnetwork.blogspot.com/2014/10/ten-shipwrecks-found-in-vietnam-waters.html