Sure! Based on your specifications, here’s a color palette that builds upon the base color #0D1D2C , using white for lighter shades and black for darker shades with the specified step intervals.

 <Ocean Depths>
1. 100 - 
                            
                            #2A4B6D
                         - Lightened base color (10% white)
2. 200 - 
                            
                            #4A7B9D
                         - Lightened base color (20% white)
3. 300 - 
                            
                            #6A9BCF
                         - Lightened base color (30% white)
4. 400 - 
                            
                            #8ABBD4
                         - Lightened base color (40% white)
5. 500 - 
                            
                            #0D1D2C
                         - Base color
6. 600 - 
                            
                            #0A1721
                         - Darkened base color (10% black)
7. 700 - 
                            
                            #080F17
                         - Darkened base color (20% black)
8. 725 - 
                            
                            #070E16
                         - Darkened base color (25% black)
9. 800 - 
                            
                            #050B13
                         - Darkened base color (30% black)
10. 900 - 
                            
                            #03080F
                         - Darkened base color (40% black)

Description:

This color palette, named “Ocean Depths,” draws from the deep, rich base of #0D1D2C , which resembles the depth of the ocean. The lighter shades blend smoothly into the darker tones, creating a harmonious and versatile palette suitable for various design applications, evoking feelings of calmness and professionalism.

Would you like to explore any specific applications for this palette, or do you need any adjustments?