Artifact preservation is one of the most important considerations when planning or implementing any action that will result in the recovery of material from a marine archaeological site. It is the responsibility of the excavator or salvor to see that material recovered is properly conserved. The conservation phase is time consuming and expensive, often costing more than the original excavation. Without conservation, however, most artifacts will perish, and important historic data will be lost. The loss is not just to the excavator but also to future archaeologists, who may wish to reexamine the material.