وَيُحْفَرُ الْقَبْرُ، وَيُلْحَدُ
Translation: The grave is dug and a lateral recess (lahd) is made.
Lahd is a lateral recess, normally on the qiblah side of the grave. Shaqq is a central trench within the grave.
The form selected must also safeguard the body given the local soil conditions.