Fukagawa Drift Container Opened — the Liquid Inside Remains 'Unidentified'

Before dawn on Aug. 21, three metal containers washed ashore on a street in Fukagawa 2-chome. On the 29th, the Third Appraisal Center followed through on the review board's Sept. 16 decision and opened, inside a sealed chamber, the one container among the three where the liquid surface's failure to track its tilt has been most consistently observed. It was the 39th day since discovery. Following the airtightness test and equipment calibration that began on the 25th and the dry-run rehearsal on the 28th, the actual procedure ran through the previously reported sequence — measuring internal pressure, cracking the lid just enough to sample gas, and judging how far to open it from there. Work began just after 10 a.m. and took about four hours to complete, the center said. The other two containers, as previously reported, remain in indefinite storage and were untouched by today's work.

The opening confirmed that the container holds a liquid that behaves like water, as previously reported. Gas sampling and analysis turned up nothing that departed significantly from normal atmospheric composition. The isotope ratio — the central question — still matched none of the known lineages, even accounting for the 147 registered as of Sept. 16 plus provisional entries since. "It's less that this is a new lineage and more that it remains unlike any of the known ones — that's the accurate way to put it," an official said, declining to elaborate further. The phenomenon of the liquid's image failing to track the container's tilt under both X-ray and acoustic measurement was reconfirmed during today's procedure, but its cause remains unexplained. "We're long past the stage of doubting the equipment. Nothing today changed the previously reported view that this likely stems from some property of the object itself."

One new finding did emerge: engraving found on the container's inner surface. As previously reported, the three containers' outer engravings showed a slight difference in lettering style; today marked the first confirmation of a separate engraving on the inside of the opened container. According to the center, the strokes of this inner engraving share some resemblance with the symbol sequence carved into the metal post that drifted onto a Kameido street on the night of Sept. 1 — provisionally registered as Lineage 148 and, as previously reported, now formally entrusted for decoding to a mathematical analysis team from the Hindic Federation. An official was careful not to overstate it: "All we can say is that they look similar. It could just be that two unrelated drift objects, different in isotope ratio and origin, happen to share a similar line shape." As with the previously reported treatment of the resemblance between Window 5's drift object and Lineage 7's 'Lit City' tablets, the center is again declining to rush toward any claim of a connection based on shape alone. Detailed photography and measurement of the inner engraving will be prioritized and shared as reference material with the Hindic team.

Attendance was limited to review-board members, Fukagawa neighborhood-association representatives who volunteered, and center staff; no press were present. One association officer who attended told this paper afterward, "Honestly, I didn't expect anything major to come out of it, but I still wanted to see it with my own eyes. 'A liquid that looks like water' is about all I can honestly say." Another resident, who had remained divided over whether the opening should happen at all, said of the fact that only one container was touched, "I'm honestly relieved the other two weren't dragged into this." The review board's chair said, "We'll keep an honest record of both what we could and couldn't confirm today. Starting tomorrow, we move into re-examining how to handle the remaining two," stressing that the procedure itself was not being treated as any kind of endpoint.

The center plans to issue a same-day bulletin on the opening and its broad results, with detailed academic data — including isotope figures and the engraving comparison — expected around early October. How to handle the remaining two containers will be taken up again by the review board in light of today's results. "We'd said opening one might let us say something about the other two," the center said. "In practice, all we can really say is that they remain just as unknown." Even so, officials added, "recording what we don't know, honestly, as we don't know it — that itself is what today accomplished." Both the cause of the liquid's non-tracking surface and the origin of the engraving remain unresolved even after the opening. Coverage of the Fukagawa containers continues.