[2] In April 2019, businessman G Gnanaraja was charged with cheating Consortium Zenith Construction Sdn Bhd executive director Zarul Ahmad Mohd Zulkifli of RM19 million between July and August 2017 at various locations in Petaling Jaya and Kuala Lumpur relating to Penang undersea tunnel project, he was arrested by the MACC.

[3]In February 2019, blogger Raja Petra Kamarudin started publishing series of articles on Penang undersea tunnel corruption scandal based on leaked MACC document which alleged the former chief minister Lim Guan Eng and various Pakatan Harapan and Barisan Nasional leaders in kickbacks amounting to hundreds of millions.

[4] UMNO secretary-general Annuar Musa called for a probe into the alleged leak of Malaysian Anti-Corruption Commission (MACC) investigation papers by Raja Petra Kamarudin.

[5] Gerakan Vice President Oh Tong Keong urged Penang state executive councillors and former chief minister Lim Guan Eng should take controversial blogger Raja Petra Kamarudin to court for defamation over the latter's undersea tunnel graft allegations.

[6] MCA president Wee Ka Siong urged the Malaysian Anti-Corruption Commission (MACC) to confirm the authenticity of leaked documents allegedly linked to its investigations into the Penang undersea tunnel project.