海底 かいてい電線 でんせん敷設 ふせつ せんだったら
kaiteidensen fusetsu sendattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 海底電線敷設船

1. If it were a submarine cable laying vessel.; If it had been a submarine cable laying vessel.

Tara Conditional