Video monitoring of the marine environment is an important tool for understanding variations in underwater habitats due to climate change. Deployment of underwater video systems incurs in fixed costs that impact in the number of samples gathered. This paper presents the version 4.0 of the POTBot (Pictures Of The Bottom) project, a low-cost automated camera that tracks its position globally, records high-definition video and logs temperature readings. Designed to be mounted in fishing gear, it works autonomously collecting information where it is deployed until it returns to base for downloading, thus incurring in no deployment extra costs.