Pirates?
The idea that the Sam Ratulangi had been raided by pirates wasn't ruled out. That's what most likely occured on the Tamaya 1, since maritime pirates were common in that region. They were most often found on the Horn of Africa and near Somalia...
The Case is Still Open
Despite countless theories, there is no definitive answer as to what happened to the Sam Ratulangi. Though there is a ship's worth of ideas, the case remains open. It surely won't be the last ghost ship to drift ashore, though...