Two Hydrofoils and one Jetfoil on maintenance support frames.
It’s interesting how deep under the water the foils would have to be.
With the Jetfoil present when I took this picture, originally in colour, from a passing HKY ferry in 1972, it means that Jetfoils are still serving Hong Kong now for at least 44 years.
Also of interest is the base of the hammerhead crane securely anchored to the pier which we don't normally see images of.
