– A "lost" film that only circulates on faded Betamax tapes. In this, Myrna plays Luz , a single mother who finds out that the "night shift" at her textile factory is actually a prostitution ring for visiting Japanese businessmen. The final 20 minutes, set entirely in a backroom with neon lights and a broken fan, are considered a masterpiece of SOV (shot-on-video) sleaze.

In the annals of Philippine cinema, the 1980s represent a paradoxical decade. On one hand, it was the golden age of mainstream giants like Vilma Santos, Nora Aunor, and Sharon Cuneta. On the other, it was the unapologetic, grimy, and electrifying explosion of "Pene" movies —a colloquial shortening of "penetration" but used as a blanket term for the country’s softcore and hardcore adult film boom.

What made Myrna C.'s films different—and thus more dangerous—was their lack of glamour. Unlike the glossy Softcore of the 90s (think Victoria Vega), the 80s "OT" films were drab, yellow-lit, and miserable. They made exploitation look like exploitation. The MTRCB confiscated hundreds of tapes of Sa Ilalim ng OT , claiming it "glorified workplace harassment." In truth, it did the opposite: it showed it as horror. The saddest chapter of this story is the silence.