Abstract: Subterranean surveying apparatus includes a support portion, a connector portion, a housing portion, a positioning portion, a monitoring portion and a control portion. The support portion includes a horizontal reference surface and a base section extending downwardly from the reference surface with mechanism for leveling the reference surface. The connector portion includes a torsionally rigid mast assembly suspended from the reference surface and extending downwardly therefrom with mechanism for selectively fixing the position of the mast assembly with respect to the reference surface. The mast assembly includes a plurality of elongated members disposed in an end to end relationship, the elongated members including end sections securable to adjoining ends of other elongated members. The housing portion includes an elongated hollow section, the upper end of which is affixed to the lower end of the mast assembly. At least one opening in the hollow section is intermediate the ends thereof.

Abstract: Subteranean surveying apparatus including a support portion, a connector portion, an instrument housing portion, an instrument positioning portion, an instrument monitoring portion and an instrument control portion; the support portion including a horizontal reference surface, a base section extending downwardly from the reference surface, mechanism for leveling the reference surface; the connector portion including a torsionally rigid mast assembly suspended from the reference surface and extending downwardly therefrom, the mast assembly including a plurality of elongated members disposed in an end to end relationship; the instrument housing portion including an elongated hollow section affixed to the lower end of the mast assembly, at least one opening in the hollow section intermediate the ends thereof, a television camera disposed within the hollow section adjacent the opening, a light source disposed adjacent to the camera; the instrument positioning portion including lifting mechanism mounted on the sup