The eastern shoreline of Funafuti Lagoon on Fongafale was modified during World War II when the airfield (now Funafuti International Airport) was constructed. The coral base of the atoll was used as fill to create the runway. The resulting borrow pits impacted the fresh-water aquifer. In the low-lying areas of Funafuti, the sea water can be seen bubbling up through the porous coral rock to form pools with each high tide. In 2014, the Tuvalu Borrow Pits Remediation (BPR) project was approved so that 10 borrow pits would be filled with sand from the lagoon, leaving Tafua Pond, which is a natural pond. The New Zealand Government funded the BPR project. The project was carried out in 2015, with 365,000 sqm of sand being dredged from the lagoon to fill the holes and improve living conditions on the island. This project increased the usable land space on Fongafale by eight per cent.