“…Over time, these reefs have become more popular and their aims have subsequently broadened (Ponti et al, 2015, Fabi et al, 2011 to account for new needs, such as recreation, habitat restoration or growth, contribution of new knowledge on species behaviour in its natural habitat or beach protection and erosion control (Encarnação & Calado, 2018, González-Duarte et al 2018, Herbert et al 2017, Liu et al 2017, Navarro-Barranco et al 2015, Firth et al 2014, Pacheco et al 2011, Ponti et al 2015, Perkol-Finkel & Benayahu 2005. This has led to increased knowledge regarding the materials used to build such structures, ensuring they are not damaging to the environment (Herbert et al 2017, Liversage et al 2017, Spagnolo et al 2014, Ponti et al 2015, Fabi et al 2011, OSPAR Commission 2009, Perkol-Finkel & Benayahu 2005 and achieving more adequate designs and sizes in accordance with the purpose in question (Lavender et al 2017, Rosental Zalmon et al 2014, Perkol-Finkel & Benayahu 2005. Waste materials were generally used, such as tyres, wrecked ships, or the remains of machines, research platforms and pipes (Meyer et al 2017, Ponti et al 2015, Perkol-Finkel & Benayahu 2005.…”