# From Bottom of Sea to Space: Quo Vadis IoT? So What About Security?
## 2 Existing Surveys
### Surveys Focusing on a Single IoT Extension
#### 2.1.2 Extensions Deployed on the Ground  
Several surveys have focused on different types of IoT extensions deployed on the ground, including the Internet of Bodies, Internet of Audio Things, Internet of Vehicles, Internet of Autonomous Vehicles, Internet of Medical Things, Internet of Wearable Things, and Internet of Bio-Nano Things. These surveys are reviewed in the following. The Internet of Bodies can be used for a wide range of services and applications for a broad spectrum of sectors. These services include, but are not limited to, medicine, safety, security, health, and entertainment. Despite this critical importance, there are only a few surveys focusing on the Internet of Bodies. One such survey has been reported in [24]. In this research, the authors argued that given the recent crisis caused by COVID-19, the Internet of Bodies can revolutionize public health and safety infrastructures in today's world. They reviewed the communication and networking requirements of this IoT extension along with related standards and protocols. These researchers presented a survey on channel modeling issues for various link types in Human Body Communication (HBC) channels. These channels are of critical importance due to the heterogeneous and lossy dielectric properties of the human body. Internet of Audio Things  
In this kind of IoT extension, audio things, such as acoustic sensors, are connected over an infrastructure capable of allowing local or remote, multidirectional communications. The authors of [25] presented an overview on this IoT extension. They established an ecosystem for this extension consisting of interoperable devices and services related to human-human and human-machine interactions. These researchers investigated design and implementation challenges in this field and developed directions for future research in this area. A survey related to this type of extension has been reported in [26]. The authors of [26] stated that the underlying protocol stacks in the Internet of Multimedia Things need to fulfill stringent requirements in terms of quality of Service (QoS), latency, reliability, bandwidth, and storage, which are raised by multimedia data. Moreover, they highlighted interoperability as a challenging task in the Internet of Multimedia Things due to the existence of heterogeneous multimedia sensors. They presented a survey on the challenges faced by seamless, interoperable communication in this type of IoT extension. The authors also studied Cloud as a promising paradigm for eliminating the storage requirements in these extensions. Internet of Vehicles (IoV)  
The Internet of Vehicles is one of the best-studied extensions of the IoT. There are several surveys on different aspects of the IoV. For example, a review of existing methods for recommending driving strategies, appropriate routes, and entertainment content in the IoV has been presented in [27]. As another example, one may refer to [28], where the authors present a survey on Business Models (BM) adapted for Fifth Generation (5G) network slicing with a focus on applications in the IoV. This technology is capable of creating virtually isolated and logically parallel networks, enabling a large range of complex services. Another survey on the applications of 5G standards and infrastructures in Vehicle-to-Everything Communications (V2X) and IoV has been reported in [29]. The evolution of traditional V2X technologies to IoV platforms has been studied in relevant research [30]. Moreover, the authors of [31] highlighted the shortcomings of existing cellular communication technologies such as Fifth Generation (5G) and short-range wireless communication standards such as Dedicated Short-Range Communication (DSRC) in supporting the high volume of data generated by IoV sensors. They presented a survey on advances in Millimeter-wave (mmWave) technology with a focus on applications in the IoV. In [32], the adoption of blockchain as a system platform for supporting the information exchange requirements of the IoV has been studied.