Image Credit: Limoncella Projekt/YouTube.A yellow Porsche 911 that spent four-and-a-half years submerged in an Italian river has made an extraordinary return after being rescued and subjected to a painstaking, years-long rebuild.The Porsche 911 from the 993 generation entered the river during heavy rain in February 2014 near Florence, Italy. Its driver escaped without injury, but the car was carried away by the current and remained underwater until it was finally recovered in 2018.What followed was an ambitious restoration led by Italian Porsche enthusiast Paolo Iacometti, who turned the seemingly ruined Carrera into the machine now known as Projekt Limoncella. The name combines a playful reference to the car's yellow colour and Italy's famous limoncello drink, while the German spelling "Projekt" provides a nod to the Porsche's origins.Porsche Disappeared Beneath the RiverThe story began on a rainy evening in February 2014 when the driver lost control of the Summer Yellow Porsche 911 and ended up in the river.AdvertisementAdvertisementConditions were unusually severe for the relatively small waterway, with the current strong enough to drag the Porsche away. Although the driver managed to escape safely, efforts to retrieve the car proved unsuccessful.It remained submerged for approximately four-and-a-half years.When the Porsche was eventually pulled from the river in 2018, the scale of the challenge became clear. More than a tonne of mud and silt had accumulated inside the car, adding around 1,100kg (2,400lb) in weight. Image Credit: Limoncella Projekt/YouTube.For many people, its condition would have made the Porsche little more than a source of spare parts. Iacometti had other, and quite frankly braver, ideas.Paolo Iacometti Saw a Porsche Worth SavingIacometti first encountered photographs of the recovered 993 Carrera on Facebook back in 2018.AdvertisementAdvertisementAt the time, he had been considering turning his father's well-preserved 993 Carrera into a more track-focused machine, but he was reluctant to heavily modify a car with such personal significance and history. The recovered river car offered a very different opportunity.He took on the enormous task of bringing the Porsche back, and the restoration became known as Projekt Limoncella.Rebuilding a Porsche After Years UnderwaterThe 993 required an extensive strip-down and rebuild after spending years beneath the water.Once dismantled, however, the car provided some surprises. The restoration indicated that accumulated mud had actually protected certain areas, including parts of the engine. That did not mean the Porsche had escaped damage, but it allowed some original components to be rescued and reused.AdvertisementAdvertisementThe chassis was eventually stripped to bare metal and reinforced using interrupted seam welding based on 993 RSR specifications. The build also took inspiration from Porsche's Cup and RSR racing cars, although Iacometti did not set out to create a straightforward RSR replica.The engine underwent an extensive rebuild, with components including the crankshaft, cylinder heads, valves and camshafts among the original parts that could be serviced and reused.From Riverbed Wreck To Running 911After years of restoration work, the project reached a major milestone on July 25, 2023, when the Porsche's engine fired into life again, almost a decade after the accident.The transformation is remarkable considering the condition in which the 993 was recovered. What emerged from the river, packed with more than a tonne of mud, ultimately became a carefully rebuilt, performance-focused Porsche.AdvertisementAdvertisementIacometti has documented the lengthy process on Instagram through Limoncella Projekt, sharing the journey from submerged Carrera to revived 911.The story is an unusual example of just how far enthusiasts will go to preserve a special car, particularly as one as beautiful as a Porsche 911. After four-and-a-half years underwater and several more years of restoration, Projekt Limoncella got a second chance few would have thought possible.