Four-wheel-drive rolls off Victorian boat ramp into surf

A four-wheel-drive has rolled off a boat ramp into the surf east of Geelong this morning.

The silver coloured 4WD was filmed partially submerged in the waters off Indented Head, on the coast of Port Phillip Bay, just after 11.15am.

Search and rescue crews found no-one inside the vehicle, authorities told 9NEWS.

Investigations are ongoing.