Tomoya Ohtani on Sonic Lost World Original Soundtrack:

Sea Bottom Segue

This is the music of the stage commonly known as seabed cavern. I express the mysterious seabed atmosphere with piano’s ambient arpeggio and strings section, and the mechanical atmosphere of Eggman’s facilities with rhythm, synth’s track, and others. All the 12 strings members bring out the grinding’s scamper sensation and the dramatic atmosphere.