Just found these dangerous examples of incompetence while excavating our patio. They are from a gas installation done 20-odd years ago by a “certified” maestro. The almost completely unsoldered Tee connection had only a slight leak, I guess the solder flux acted as a partial seal.
If gas had had space to accumulate, this could have caused an explosion.
As for the crushed pipe, the maestros just filled the trench with the excavated material, instead of using sand to protect it. Luckily this was the older heavier-gauge pipe, the modern stuff would have probably punctured.