\documentclass{beamer}
\usepackage{graphicx}
\usepackage{array}
\usepackage{multirow}
\usepackage{capt-of}
\usepackage{tabu}
\usepackage{xcolor}
\usepackage[backend=biber,style=authoryear,sorting=none]{biblatex}
\addbibresource{colinBibStuff.bib}
\renewcommand{\thefootnote}{\roman{footnote}}
\begin{document}
\title{Simple Beamer Class}
\author{Sascha Frank}
\date{\today}
\frame{\titlepage}
%\frame{\frametitle{Table of contents}\tableofcontents}
\section{Subsection no.1.1 }
\begin{frame}
\begin{columns}
\begin{column}{0.7\textwidth}
\begin{block}{Introducing the project "Explodrone"}
\begin{itemize}
\item xdgfhdfh
\item dfwhdwjwdj
\item dhgwdfhd<j
\item wdjwftjwyri
\end{itemize}
\end{block}
\end{column}
\begin{column}{0.3\textwidth}
\centering
\includegraphics[scale=0.1]{example-image-a}\\
{\footnotesize \emph{Explodrone during an experiment}\par}\bigbreak
\includegraphics[scale=0.1]{example-image-b}\\