## 1 Introduction  
Temperature data from the oceans are very important to understand the ecosystems and assess the human impact on nature. There is large scale monitoring of sea surface temperature using both remote sensing and in-situ platforms [1; 2; 3; 4], but there is a lack of depth resolved temperature profiles for inshore regions, besides the use of 'animals of opportunity' [5; 6] and human volunteers [7; 8] which help to monitor the depths/temperature profile data to address this issue. In fact, Citizen Science (CS) is becoming a powerful tool, bringing together scientists, society and decision makers. Recent reviews show that the last decades have seen a tremendous increase in CS projects and participation, thanks to technological advances amongst other elements. CS projects have also made contributions to science [9; 10; 11; 12]. Recreational SCUBA divers are one of the important contributors to marine citizen science. Their key instrument is a dive computer (DC) that they need to use in order to monitor depth, time and in some models the amount of gas remaining in their tank. Dive computers include algorithms to predict the likelihood of decompression sickness and calculate the safe ascent rate for a diver. For that reason, the modern electronic DC can be considered as the most significant advancement in diving since the invention of the Aqualung by [PERSON]. Modern dive computers include an interface to allow the upload of the log of the dive to a mobile device or a desktop computer. Although there are standards on the accuracy and precision of dive computers (EN 13319) [13], one must be careful while using their output in scientific study. The use of this data will depend on the scientific question in mind. For example, there may be scenarios where an error of 1 \({}^{\circ}\)C is unacceptable, in which case improvements need to be made in the accuracy and consistency of dive computer temperature recordings [14].  
[PERSON] and [PERSON] studied 47 dive computers and concluded that caution should be employed when using displayed and/or recorded depth and temperature data from dive computers in scientific or forensic studies [15]. Their conclusion on temperature is based on the deviation of up to 5.1 \({}^{\circ}\)C from nominal values. Caution is recommended for the use of dive computers as depth measurement tools in scientific study or underwater surveying.  
[PERSON] et al. reviewed the potential of SCUBA divers as oceanographic samplers when using their dive computers to augment aquatic temperature monitoring [14]. They have also attempted to use the temperature difference between surface and lowest temperatures recorded by the Operational Sea Surface Temperature and Sea Ice Analysis database [1] and the conductivity, temperature and density instruments respectively, to provide an idea of the degree of error of temperature recordings of dive computers. Their findings agreed with the results from [PERSON] and [PERSON] [15]. The overall outcome indicated that in a range of test temperatures between 10 and 17 \({}^{\circ}\)C, the median variance was 5.1 \({}^{\circ}\)C (with a range of \(-\)4.0 to 1.1 \({}^{\circ}\)C). Furthermore, they concluded that identification of the depth of the thermocline is likely to be possible in the future with a more structured collection of data, but will depend on the strength of the thermocline and the quality of the dive computer.  
The aim of this study is to simulate the thermocline with a pair of sea aquarium basins and determine the protocol to be used to detect the thermoclines using the dive computer logs.