The LASER PTM has been the first underwater pipeline post-trenching machine that SEA has designed and assembled in order to operate in hard seabed, with sedimentary rocks such as calcarenite, sandstone and limestone.

By improving the Laser PTM design, SEA has designed and assembled the RACK PTM, an underwater pipeline post-trenching machine, that is more resistant and with higher trenching performance in rock.

By employing this PTM, SEA has successfully carried out projects in rocky areas where the post-trenching method had not been considered feasible before.