Postihylky

A single rib breaks the surface in a quiet bay on the south side of Ryssö island, and the rest of a 19th-century wooden hull lies below it on mud and sand at three to five metres. The footprint is roughly fifteen by six metres. Heavy algae covers the timbers and there is nothing to penetrate. On a clear day the whole hull reads from the surface and the dive becomes a slow swim along one side and back along the other, bounded by exposure rather than by gas. In August a thick wetsuit can work; in May or October only a drysuit will. Buoyancy matters even at four metres: the mud lifts on contact and the surviving timbers are statutorily protected.

This is a side dive with a backstory bigger than the wreck itself. The strait the hull sits in is called Engelsmansundet, "Englishman's strait", because both the Heritage Agency record and the wreck-divers' catalogue identify the vessel as a 19th-century English schooner-bark that drifted into the channel when its anchors failed in a storm. The shallowness is the other unusual thing. Most Hanko wrecks are dives; this one is a snorkel target that also works as a check-dive, with one surviving rib reaching to half a metre under the waterline. It suits a wide-angle camera in good light, and the sources are clear it is not a destination.

The Heritage Agency entry (Hanko 1409, Ryssön eteläranta) dates the wreck to the 1800s and classifies it as a wooden vessel under the Antiquities Act, with Harry Alopaeus surveying the lower hull in 1976 after a 1965 Urheilusukeltajain liitto report. The Finnish wreck-divers' catalogue card, compiled in 1999 and citing two Finnish wreck books from 1988 and 1996, records the vessel as a kuunariparkki of roughly fifteen by six metres, the surviving timbers heavily algae-covered and probably burnt at some point. The Agency further records that the ship may have been an English brig from Riga lost on 31 October 1863 in a five-day storm; that identification rests on a now-defunct online reference and stands as the Agency's published hypothesis. The "Posti" nickname predates the 1990 wreck-divers' archive entry and its origin is undocumented; the Heritage Agency record does not identify the vessel as a postal ship, so the English "post wreck" subtitle is best read as a translation of the local nickname.

Cold water is the dominant hazard at every depth in this part of the Gulf of Finland; even in August the bottom sits at eight to fourteen degrees. Plan exposure first and gas second. The wreck is statutorily protected: no touching, no lifting, no anchoring on or near the structure. Boat traffic crosses the Ryssö approach, so deploy an SMB on ascent. The site is not on the standard Hauensuoli buoyed-park programme. A small-boat charter or club outing from Hanko or Tvärminne is the realistic way to reach it. Compass and SMB stay standard kit; the strait is sheltered but not a reason to leave them behind.