Sorry they are not Tiger 40 by ST !!!
They are Griffon hovercraft Model should be 8000TD
http://www.caas.gov.sg/caas/en/About_CAAS/CAAS_Services/Airspace_MO/Airport_Emergency/Vehicles.html
This is the acutal picture of the CAAS griffon hovercraft.
It seem that Griffon 8000TD was selected to commonly
operated by world wide SAR services which singapore CAAS is part of
.
Griffon Hovercraft Ltd (GHL) has designed and built more
diesel-powered hovercraft than any other company. This paper looks
at the design and production of its largest design to date – the
Griffon 8000TD – the first craft of which ran in May 2000, being
the first craft of six delivered to the Indian Coast Guard. Since
then different derivatives have been delivered to the Saudi Arabian
Border Guard and the Korean National Maritime Police Agency. More
are on order for the Saudi Arabian Border Guard and the Civil
Aviation Authority of Singapore.
Griffon 8000TD, 14 of which are currently in service in India,
Saudi Arabia, Korea and Singapore.
Sorry sorry.... I really thought they were Tiger 40's.
