Hallin Marine said its shareholders have agreed a $170m takeover bid by Superior Energy Services.
In a filing with the London Stock Exchange, Hallin Marine said the required majority had voted in favour of the deal.
Superior Energy has offered £2.33 ($3.80) per share in cash to take over the London-listed subsea vessel owner.
Hallin Marine has a fleet of four subsea operations vessels and three ROV and survey vessels.
The agreement is expected to be effective before 26 January.