Neither the State nor an employee of the State is liable under this chapter for any injury caused by a condition of the unimproved and unoccupied portions of:
(a) The ungranted tidelands and submerged lands, and the beds of navigable rivers, streams, lakes, bays, estuaries, inlets and straits, owned by the State.
(b) The unsold portions of the 16th and 36th sections of school lands, the unsold portions of the 500,000 acres granted to the State for school purposes, and the unsold portions of the listed lands selected of the United States in lieu of the 16th and 36th sections and losses to the school grant.
(Added by Stats. 1963, Ch. 1681.)