A red cross reveals the presence of a stratum of \l;titanium ore\u object\titanore; in the subsoil. It will be possible to extract it using a \l;derrick\u object\derrick;.
A \l;sniffer\u object\botsr; will lay down a red cross each time it uncovers a deposit. \l;Sniffer bots\u object\botsr; can also detect the presence of \l;uranium ore\u object\uranore; as indicated by a \l;yellow circle\u object\uranspot; and of energy as indicated by a \l;green cross\u object\enerspot;.