Sea — Territorial waters — Ownership of seabed beneath territorial waters of South Africa vesting in President of South Africa — Sea-shore Act 21 of 1935 — Laying of submarine telecommunications cable in territorial waters — Section 70(1) of Telecommunications Act 1996 — Whether “land” and “waterway” could mean seabed in territorial waters — Whether lease of seabed required for laying of cable — The law of South Africa