A probe affected the USS Yamato on stardate 42592.72 causing a malfunction in the ship's dilithium seals, resulting in the release of matter and antimatter and causing the vessel to explode, killing all hands aboard. Upon achieving a standard orbit of Iconia several days later, another probe was launched at the USS Enterprise-D, but it was destroyed before any systems could be affected. However, the Enterprise previously downloaded the Yamato's logs, which contained the Iconian program, thereby "infecting" the Enterprise with the same program that destroyed the Yamato. The data "infection" was later removed. Another probe was launched at the Romulan vessel Haakona. It, too, was destroyed before it could upload any information. However, it also downloaded the Yamato's logs and inadvertently