The company developed crane vessels to lift large offshore platforms and modules.

In 1978, HMC commissioned Mitsui to construct the two sister semi-submersible crane vessels, DCV Balder and SSCV Hermod.

[2] In 1988 HMC formed a joint venture with McDermott called HeereMac.

[3] The SSCV Thialf was added to the HeereMac fleet, and upon the split of the companies in December 1997, Heerema took ownership of the Thialf, the largest deep water construction vessel and is capable of a tandem lift of 14,200 t (15,600 short tons) The DCV Balder was affected by a flooding incident in 2006 and was put out of service for a few months.

[5] Heerema presently owns and operates the following crane vessels: Plus a number of barges.