Seafloor landers

The Modular MARUM Seafloor Lander (MSL) is a submersible autonomous device manufactured by Develogic subsea systems GmbH according to our requirements for carbonate system observations. The system has an integrated acoustic modem UAP.COM for communication and data transfer, a PORT.8 multifunctional interface and data logging module, a satellite recovery beacon for transmission of GPS position via IRIDIUM satellite telemetry at surface and an Acoustic Doppler Current Profiler Nortek Signature 100. Additionally, the MSL has an integrated depth sensor (Keller PAA-10LHP), a conductivity and temperature sensor (Seabird SBE37-SM,) a pH sensor (AMT) and a pCO₂ sensor (Franatech).

Lander cad — Ansicht des modularen Develogic Meeresboden Lander der MARUM Marine Geotechnik Gruppe.

Rated deployment depth	3000m
Weight in air, including ballast without batteries	459 Kg
Dimensions (L x W x H)	910mm x 901mm x 880mm
Ballast plate weight	190kg

Key specifications of the MSL lander

SPIRULA Shallow Water Lander

Small vehicle tethered to drum on lander

Energy on-board and on lander

From remotely controlled to fully autonomous

Repeatable (autonomous) surveys

Variable speeds and heights possible (within system constraints)

Reduced risk of system loss

Drum diameter	0.2 m
Cable Length	approx. 20 m
Coverable Area	up to 1000 m^2
Involute Spacing	1.25 m
Variable speed	0.1 - 0.7 m/s
Survey time	approx 1h (at 0.5 m/s)