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The OCC-SCXYZ series optical submarine cable, well known for its "3 Divided Steel Segment" core design, has a track record supported by more than 400,000km of cable that has been supplied for various projects worldwide since its first manufacturing in the 1980's. This unique core design, providing robust high pressure resistance and low torque generation characteristics, offers the ideal structure to take full benefit of recent high performance optical fibers. The development towards higher bit rate optical communication systems has been rapidly evolving in recent years and the advances in transmission technologies have increased the level of requirements for each element of the system. Also, with the introduction of Open Submarine Cable System concept, where both wet plant (cable, repeater and branching unit) and dry plant (SLTE) are designed to start operation under a minimum configuration, the system's "cost per bit" has been given more importance than ever. During IWCS 2019, we presented evaluation results of OCCSC6YZ series, our advanced small diameter submarine cable. And, in this paper we present the sea trial results of OCC-SC630 cable. The mini block for sea trial was configurated with various cable types (LWS, SA and DA), joint boxes, dummy repeater and dummy ROADM unit as shown in Figure 1. We conducted the sea trial with previously mentioned mini block, on the sea area around Hachijyo island. Water depth of trial area was 1,600 to 2,400m. We continuously monitored optical attenuation during laying and recovering operations and confirmed stable performance. As result of laying, holding and recovering operations, cable onboard handling ability and laying/recovering performances using conventional drum cable engine were also good. Through sea trial operations we confirmed suitability of cable design, including joint boxes and couplings (connection) to repeater and ROADM. [ABSTRACT FROM AUTHOR]