The project was an immense undertaking, to say the least, requiring massive infrastructure redesign and about 8.5 billion USD (6 billion Euros) to fund.
Perhaps the biggest hurdle was the first step, which required submerging the infamously gnarled Madrid traffic through 43 km (approximately 26.7 miles) of new underground tunnels.
Once the tunnels were operational underground, the progression above ground started to emerge, with landscape architecture never before seen on this scale.
The new areas along the river were designed by using the “3+30” method of dividing 80 hectares into a “trilogy of strategic projects” that separate the elongated area into 47 various sub-projects including a large pine tree park, multiple sports areas, 30 km (approximately 18.6 miles) of bicycle paths, 11 new playgrounds, six installations for the elderly, and even a sandy beach with humidifiers, parasols, and a kayak-paddling area.