US investor Bob Robotti is urging OSV giant Tidewater to find another merger partner.
His Robotti & Company Advisors has a 6.1% stake in the OSV owner worth $40m.
Robotti has written to the board of Tidewater recommending that it drives further consolidation in the sector as prospects improve.
Last year's merger with GulfMark Offshore created the world's biggest offshore vessel fleet, following Tidewater's Chapter XI restructuring.
