When inspecting seawalls we will probe the ground to see how deep the seawall panels extend below the surface of the canal. Knowing the depth allows us to advise whether the panels are securely embedded into the ground, or not. Seams between panels will be examined, as well as the surface of the panels, and the seawall cap.
When repairing an existing seawall there are usually a variety of options with a variety of prices. A seller will obviously choose the cheapest option. You as a buyer want the seawall to last a long time and would choose a different option than the seller.