So, you see there is reduction in the force, as you go towards the seabed. So, but the reduction is not drastic it is quite steady, there is a steady decrease in the drag force as we go towards the seabed. This in the event of a deep water conditions, what will happen? This rate of reduction will be quite drastic particularly after z equal to minus l naught by 2. So, the same thing is observed in the variation of inertial force, again the inertial force will be varying like this. And what about the total force? When your superpose both the total force variation will be as shown here. So, you see that gradual reduction in the force as we go towards the seabed.