Electromagnetic fields (EMFs) emitted from subsea cables have become a common feature of the marine environment with the global expansion of marine renewable energy developments (MREDs). Yet there are very few assessments of potential EMF effects on the behaviour or biology of marine organisms. The limited literature often has conflicting evidence and no standardised testing methodology. The uncertainty is concerning for stakeholders, such as fishers, who are dependent upon the predictability of marine organisms. This paper aimed to critically review the available literature on EMFs to conclude if marine species are at a significant biological risk of contact with energised subsea cables. Presently, there is no evidence of a significant threat to marine organisms encountering subsea cables.