The land comprising the seaward section of the tunnel system shall, as it becomes occupied by or on behalf of the Concessionaires working from England, vest in the Secretary of State, together with so much of the surrounding subsoil as is necessary for the security of the part of the system so occupied.

Where the land agreed to be granted under a Concession lease consists of or includes the land and subsoil mentioned in subsection (1) above, the interest in that land and subsoil shall vest in the Concessionaires under the lease as that land becomes so occupied, as if granted by the Secretary of State immediately on the vesting in him of that land and subsoil by virtue of subsection (1) above.

The Secretary of State shall, at such time or times as may be agreed by him and the Crown Estate Commissioners, pay to those Commissioners, in respect of the vesting in him by virtue of subsection (1) above of any land of the Crown Estate, such an amount as those Commissioners would have obtained for it on a sale in accordance with section 3(1) of the [1961 c. 55.] Crown Estate Act 1961 (duty as to consideration).

In subsection (3) above "land of the Crown Estate" means land which, immediately before the vesting of that land in the Secretary of State by virtue of subsection (1) above, was vested in Her Majesty in right of the Crown.

References in this section to the seaward section of the tunnel system are references to that system, so far as lying under the foreshore and the bed of the sea as far as the frontier.