Delivered in 2009, the 318,000 dwt Leonidas features a machinery installation incorporating a Wärtsilä 7RT-flex82T main engine with an output of 31,640 kW at 84 rpm.

The vessel is also equipped with the Super Trident Sewage Treatment Plant ST2A, certified to meet IMO MEPC 159(55) guidelines. Optimised for the treatment of black and grey wastewater flows, and suitable for conventional gravity and vacuum fed collection systems, the Wärtsilä Hamworthy Sewage Treatment Plant is controlled automatically. This allows unattended operation, with reduced maintenance requirements and lower long-term operating costs.