Related Clues:

• Dig deeply
• Impolite remark
• Like a bunch
• Archaeological site
• One way to get underground
• Probe
• Understand, slangily
• Archaeological excavation
• Get to the bottom of things?
• Really get into
• Jab
• Use a mattock
• With 52-Across, what treasure hunters do
• Do some research
• Dig for data