Compounds of 海底

• 海底
  (n) (1) bottom of the ocean
  (adj-f) (2) undersea
  submarine
  (P)
• 海底谷
  (n) submarine valley
  submarine canyon
• 海底谷
  (ik) (n) submarine valley
  submarine canyon
• 海底火山
  (n) submarine volcano
• 海底炭田
  (n) submarine coal field
• 海底地形
  (n) submarine topography
• 海底地震
  (n) submarine earthquake
• 海底電信
  (n) submarine telegraphy
• 海底油田
  (n) offshore oil field
• 海底撈月
  (n) totally useless (fruitless) effort
  wasting time on an impossible task (like trying to scoop up a reflected moon from the bottom of the sea)
• 海底ケーブル
  (n) undersea cable
  submarine cable
• 海底トンネル
  (n) undersea tunnel
• 海底電線敷設船
  (n) cable layer