Salerie car park will be closed this weekend while it is surveyed.
The site sits on land that was reclaimed from the sea in the 1980s.
It is thought that over the years some of the materials have moved, potentially letting sea water in.
The car park has had a lot of repair work in the past after reports of depressions and dips on its surface.
This weekend a team will be carrying out an underground survey using a radar.
The car park will be closed from 8am on Saturday to 8pm on Sunday.