noun, noun which may take the genitive case particle 'no'
trans-Pacific; crossing the Pacific
Used as a noun or adjectivally with の to describe routes, flights, voyages, cables, etc., that span the Pacific Ocean.
He succeeded in a solo trans-Pacific voyage.
This trans-Pacific cable has high communication speed.
Refers to trans-Atlantic crossing, while 太平洋横断 specifically refers to crossing the Pacific Ocean.
Compound of 太平洋 (Taiheiyō, 'Pacific Ocean') + 横断 (ōdan, 'crossing'). The reading follows standard on'yomi.