Webster's English Dictionary

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undersea

1. un.der.sea \.*n-d*r-.se-\ aj 1: being or carried on under the sea or 
   under the surface of the sea {R@ fighting} 2: designed for use under the 
   surface of the sea {~ fleet} 
2. un.der.sea or un.der.seas \.*n-d*r-'se-\ \-'se-z\ av : under the sea : 
   beneath the surface of the sea {photographs taken (R@}