Related Clues:

• Comprehend — a depth of six feet
• Make sense of breaking promise in broadcast wave
• Question or examine closely
• Major investigation
• Investigate closely
• Certain NASA launch
• Think in depth
• Seriously look into
• Nautical unit of measure
• Sailor's measure of depth
• See circled letters
• Six feet; make sense of
• Get to the bottom of sound
• Work out the depth
• It's just six feet down - get to the bottom of it