 The solution was to modify the LSM assigned to NRL so that the towed vehicle could be launched and towed through a center well.Conversion of "LSM-398" began in June 1953 according to plans developed by Bureau of Ships at the Norfolk Naval Shipyard.A center well long by wide was cut through the centerline with an elevator carriage to house the towed body, or "fish", as it was raised and lowered through the well.