We use the Minerve virtual reality software to bring undergraduate students to an unusual field trip at 1200 m below sea level in the Lesser Antilles area. This region is located above an active subduction zone responsible for intense volcanic and seismic activity. In particular, we focus on the Roseau submarine fault that ruptured during the M_w 6.3 Les Saintes earthquake and presented a fresh scarp that the students can analyze and map in VR. They compile their results in a GIS project.