What is the fine-grained topic of the following text: The delivery ceremony of the 58.7 m AHTS vessel YX3157 from Yuexin shipyard for Martens Marine, Singapore, was held at the end of October, according to a statement released by Yuexin Ocean Engineering. Only return the topic.
Delivery ceremony of AHTS vessel YX3157 from Yuexin shipyard for Martens Marine