For the air, I am trying to use he code below. But I am getting an error:
"Fatal Error in Renderer: A POV-Ray internal nesting limit was reached."

cylinder // Air
{
 < 0.0, 0.0,  0.0 > < 0.0, 0.0, 5000.0 > 1500.0
 hollow
 interior
 {
  ior 1.3
  fade_distance 10
  fade_power 1001
  fade_color < 0.5, 0.7, 1.0 >
  media
  {
   scattering
   {
    3
    < 0.5, 0.65, 0.4 >
    extinction 1.0
   }
  }
 }
}

------------------------

For the water body, I am using successfully this (still dependent on the
blue of the future air medium):

difference // Water
{
 cylinder { < 0.0, 0.0,  0.0 > < 0.0, 0.0, 5000.0 > 1500.0 }
 cylinder { < 0.0, 0.0, -0.1 > < 0.0, 0.0, 5000.1 > MyWaterLevel }
 material
 {
  texture
  {
   pigment { color rgbt < 0.2, 0.7, 0.3, 0.5 > }
   finish
   {
    ambient 0.0
    diffuse 0.0
    emission 0.0
    reflection
    {
     0.0, 1.0
     falloff 5
     fresnel on
    }
    specular 0.4
    roughness 0.003
   }
   normal
   {
    function { f_ridged_mf(x, y, z, 0.1, 3.0, 7, 0.7, 0.7, 2) } 0.8
    scale 0.13
   }
  }
  interior
  {
   ior 1.3
   fade_distance 10
   fade_power 1001
   fade_color < 0.8, 0.2, 0.2, 0.5 >
   media
   {
//    absorption < 0.8, 0.6, 1.0, 0.5 >
    scattering
    {
     3
     < 0.5, 0.65, 0.4 >
     extinction 1.0
    }
   }
  }
 }
 normal
 {
  function { f_ridged_mf(x, y, z, 0.1, 3.0, 7, 0.7, 0.7, 2) }
  0.8
  scale < 0.13, 0.4, 0.13 >
 }
}

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