Desertacre

Question
Alex owned a fee simple absolute in Desertacre, a 500-acre tract of desert land. Desertacre was unimproved, except for a well on the land; a black electrical cable mounted on poles connected the well’s pump engine to the only power line in the region, which adjoined the west side of Desertacre. Twelve years ago, Alex conveyed the east half of Desertacre to Beth in return for $250,000; the deed did not create any express easements. Beth planned to build a home on East Desertacre when she retired.
One week after Beth purchased the land, she installed an underground electrical cable that ran from her planned home site, crossed West Desertacre (Alex’s retained land) for a distance of 1,000 feet, and then connected with the power line. She used a tan-colored cable, which was buried 12 inches below the ground in most places; but there was one area on West Desertacre where 25 feet of the cable were barely visible on the land surface if a person looked closely. Beth used the electricity to power four large lights which she kept on all night to deter trespassers. Alex never noticed the tan cable, but he sometimes wondered where Beth got the electricity for her lights.
Five years ago, Alex borrowed $100,000 from Carl in order to build a cabin on West Desertacre; the loan was evidenced by a promissory note and secured by a mortgage on the property, but Carl did not immediately record. Alex began construction, but ran out of money to complete the project. He accordingly borrowed $50,000 from Dana; the loan was evidenced by a promissory note and secured by a mortgage on the property. Dana recorded her mortgage immediately; two days later, Carl recorded his mortgage. Neither Carl nor Dana ever visited the land.
While working on the cabin one year ago, Alex was badly bitten by a wild turkey, became paralyzed, was unable to work, and accordingly failed to make the payments due on the loans from Carl and Dana. In September, Carl sent Alex and Dana a notice stating that: (1) Alex had defaulted; and (2) Carl had elected to accelerate the debt and begin foreclosure proceedings.
Carl scheduled a nonjudicial foreclosure sale for noon on Thanksgiving Day, on West Desertacre. At that time, the only bidders were Carl and Fiona; Carl bid $100,000, but Fiona then bid $100,001 and acquired the property. Alex then filed a lawsuit to set aside the sale.
What is the state of title to West Desertacre? As part of your answer, be sure to discuss whether the foreclosure sale will be set aside.