Morphball Pirates

"Morphball Pirates" are named in an unused and empty layer for the Scrapvault room. This may be indicative of a type of Space Pirate or action that was scrapped from Metroid Prime 3: Corruption. If this was referring to a Pirate variant, it would suggest that the Pirates had overcome their failures to reproduce Morph Ball technology in Metroid Prime, described in the Pirate Data entry "Hunter Weapons", and were now using working replications of the technology. Pirates were shown to be capable of crawling in tunnels after Samus in Metroid: Zero Mission, so it is also possible that this layer title described Pirates who would follow Samus into the Morph Ball tunnels in the Scrapvault.