This business segment is carried out by two subsidiaries: PT OTS Internasional (OTSI) and PT Humpuss Transportasi Curah (HTC). They perform tug assist operations, which involve the use of offshore support vessels (or tugboats) to aid activities at offshore locations, such as oil and gas drilling facilities.

The types of vessels used are Anchor Handling Tug Supply (AHTS) vessels and tugboats. These vessels primarily serve the following functions:

1. Assisting in pulling, pushing, or positioning drilling rigs.
2. Supporting large vessels when docking or leaving port.
3. Providing operational assistance, including anchor handling and logistics transportation.