A system comprising a depth compensated actuator and a gas accumulator, wherein the system with the depth compensated actuator and the gas accumulator is suitable to form a part for example of a transportable inline depth compensated heave compensator for subsea lifting or loading operations, the depth compensated actuator comprising: - a hollow rod actuator, comprising a first cylinder a first ring piston with a hollow rod, connection means at each axial end of the hollow rod actuator and a second cylinder, mounted concentric with the first cylinder and fastened to the upper end of the cylinder; - the ring piston is adapted to slide on the outer diameter of the second cylinder; - a first volume is formed by the outer diameter of the hollow rod, the lower end of the first cylinder, the inner diameter of the first cylinder and the ring piston, and may be filled with oil or gas; - a second volume is formed by the outer diameter of the second cylinder, the upper end of the first cylinder, the inner diameter of the first cylinder and the ring piston, and may be filled with oil, gas or be under vacuum; - a third volume is formed by the inner diameter of the second cylinder, the upper end of the first cylinder, the inner diameter of the hollow rod and the lower end of the hollow rod, and may be filled with oil, gas or be under vacuum; - a depth compensation device is connected to either the second volume or the third volume via conduit means; and the gas accumulator comprising the following elements: - a first accumulator cylinder - a second accumulator cylinder having a smaller diameter than the first accumulator cylinder, - a piston configured to reciprocate inside the first accumulator cylinder, dividing the first accumulator cylinder into a ninth volume and a tenth volume, and a piston rod fixed to and projecting out from the piston, the opposite end of the piston rod being position inside the second accumulator cylinder, and - a first conduit device for establishing fluid communication between volume of the gas accumulator and volume of the actuator; and - a second conduit device for establishing fluid communication between accumulator volume and the actuator volume, a reversible pump forming a part of the second conduit device. - a hollow rod actuator, comprising a first cylinder a first ring piston with a hollow rod, connection means at each axial end of the hollow rod actuator and a second cylinder, mounted concentric with the first cylinder and fastened to the upper end of the cylinder; - the ring piston is adapted to slide on the outer diameter of the second cylinder; - a first volume is formed by the outer diameter of the hollow rod, the lower end of the first cylinder, the inner diameter of the first cylinder and the ring piston, and may be filled with oil or gas; - a second volume is formed by the outer diameter of the second cylinder, the upper end of the first cylinder, the inner diameter of the first cylinder and the ring piston, and may be filled with oil, gas or be under vacuum; - a third volume is formed by the inner diameter of the second cylinder, the upper end of the first cylinder, the inner diameter of the hollow rod and the lower end of the hollow rod, and may be filled with oil, gas or be under vacuum; - a depth compensation device is connected to either the second volume or the third volume via conduit means; and - a first accumulator cylinder - a second accumulator cylinder having a smaller diameter than the first accumulator cylinder, - a piston configured to reciprocate inside the first accumulator cylinder, dividing the first accumulator cylinder into a ninth volume and a tenth volume, and a piston rod fixed to and projecting out from the piston, the opposite end of the piston rod being position inside the second accumulator cylinder, and - a first conduit device for establishing fluid communication between volume of the gas accumulator and volume of the actuator; and - a second conduit device for establishing fluid communication between accumulator volume and the actuator volume, a reversible pump forming a part of the second conduit device.